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Re: [uk_jugglers] UV lights - cheap

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  • Dave Law
    Thanks for the reply, more curios than anything and I ve already got a tube so I ll stick with that for now. Thanks for the info though Dave ... From: Ewano
    Message 1 of 17 , May 17, 2001
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      Thanks for the reply, more curios than anything and I've already got a tube so I'll stick with that for now.

      Thanks for the info though

      Dave
      ----- Original Message -----
      From: Ewano
      To: uk_jugglers@yahoogroups.com
      Sent: Saturday, October 06, 2001 2:23 AM
      Subject: Re: [uk_jugglers] UV lights - cheap


      > Oops forgot the link

      > We have reduced the price of the Hewlett Packard Deuterium lamps down
      > to just £20 uk pounds. (HP price is £380)so if you want some pure UV
      > light go to
      > http://www.bullnet.co.uk/shops/test/strange.htm

      All very well if you are going to build some analytical instruments, like
      spectrophotometers, liquid chromatography detectors, medical analyzers,
      pollution analyzers, colorimeters, and densitometers.

      I doubt if you would find then usefull for juggling rooms though. Especially
      as you need a specialist power supply for them.More info can be found here:

      http://www.istcorp.com/lite-di.htm

      They emit high quantities of UV radiation usually along a small angle of
      dispersion. I'm not sure that they emit as much as a tube though, as the
      tube is much larger and so has a greater emitting area. Tubes give a much
      wider distribution of light, which causes less shadows. Especially when you
      have two of them.

      Anyway, did you want a tube - or are you still going after the specialist
      bulbs and power supply?

      Ewano..


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    • Ewano
      ... All very well if you are going to build some analytical instruments, like spectrophotometers, liquid chromatography detectors, medical analyzers, pollution
      Message 2 of 17 , Oct 5, 2001
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        > Oops forgot the link

        > We have reduced the price of the Hewlett Packard Deuterium lamps down
        > to just £20 uk pounds. (HP price is £380)so if you want some pure UV
        > light go to
        > http://www.bullnet.co.uk/shops/test/strange.htm

        All very well if you are going to build some analytical instruments, like
        spectrophotometers, liquid chromatography detectors, medical analyzers,
        pollution analyzers, colorimeters, and densitometers.

        I doubt if you would find then usefull for juggling rooms though. Especially
        as you need a specialist power supply for them.More info can be found here:

        http://www.istcorp.com/lite-di.htm

        They emit high quantities of UV radiation usually along a small angle of
        dispersion. I'm not sure that they emit as much as a tube though, as the
        tube is much larger and so has a greater emitting area. Tubes give a much
        wider distribution of light, which causes less shadows. Especially when you
        have two of them.

        Anyway, did you want a tube - or are you still going after the specialist
        bulbs and power supply?

        Ewano..
      • Karen Whitby
        ... Use a slinky (the wire/plastic spring toy which children roll down the stairs), they are cheap, great protection and come in lots of funky colours - I have
        Message 3 of 17 , Oct 7, 2001
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          > pps. Just so you all know, these things come without
          > a cover, so you'll have
          > to make one out of wire mesh or something if you are
          > going to be throwing
          > things about near them.

          Use a slinky (the wire/plastic spring toy which
          children roll down the stairs), they are cheap, great
          protection and come in lots of funky colours - I have
          got a purple one which enhances the UV light and a
          rainbow one just for fun!
          >
          >
          >


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        • Paul Seward
          /me brushes the dust off his lampie hat stored carefully from when he worked at stage electrics all those years ago... There are (in general) 2 types of UV
          Message 4 of 17 , Oct 8, 2001
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            /me brushes the dust off his lampie hat stored carefully from when
            he worked at stage electrics all those years ago...

            There are (in general) 2 types of UV light source. UVA and UVB. I
            can't stress the diferences between them enough. (Unfortunately
            I can't remember which was bad :-) Anyway, one is the type of light
            emitted by the UV tubes in tanning beds which is bad for the eyes
            (not to mention the skin cancer risks) this is the bad one (from memory
            its UVA but I could be wrong)

            The other type is also refered to as "Blacklight" and this is the type
            of tube you want.

            Luckilly, despite be not being able to reliably remember the names
            there is an easy way to check that youre buying the right type of
            tube.

            If the tube is a dark purple colour, youre OK. Thats the safe one.
            If it is pale blue or white in colour thats the bad one. You need to
            be careful of this because (from what I remember) the bad ones
            are cheaper.

            > Ok cats and kittens, I've decided to kit out my front room as a juggling
            > practice room. As part of this I'm going to install two 4ft UV tubes in
            > there. I looked at the cost and they are 30 quid a unit (bulb + housing
            > unit) - being a tight Scottish git I thought "Wonder if I can get them
            > cheaper?".

            Absolubtly! (That is a bit on the expensive side... I paid about £10 for
            my tube 4 years ago... but then I didn't have to pay for a holder)

            > After going down to the local electrical dealers I have managed to wangle a
            > deal with them for bulk buying of UV lights. If I buy 5 or more of them, I
            > get each unit for 20 quid. Now I only want two, but if any of you lot or
            > your friends are interested in any give me a shout and I'll just ask for as
            > many as you lot want(within reason). I'll be at the Manchester con -
            > stopping off in Leeds on the friday night for Cabaret Heaven - so there are
            > two destinations I can
            > deliver to, but I don't know how much room there will be in the car.
            > Certainly will be able to get them to Durham as it's just down the road from
            > me.

            I'd be interested in a tube only price (I don't need the holder, theyre only
            standard flourescent tube holders, nothing special, and I already have
            several of those that I raided out of a skip for another project last week...
            besides, you can get them for £8 at BnQ (Or about £15 for one with a wire
            mesh guard already installed)

            Actually, thinking about it, I'm only interested if theyre the "thick" type.
            (There are 2 diameters of flourescent tube, thin (approx 1" dia) and
            thick (approx 2") as the balast circuit i'm using will only dim/flash the
            thick tubes reliably as they have a slightly different gas mixture in them)

            > pps. Just so you all know, these things come without a cover, so you'll have
            > to make one out of wire mesh or something if you are going to be throwing
            > things about near them.

            The slinky idea is good. Another option is to mount a length of guttering
            on the tube holder (behind the tube) which has been carefully covered
            in silver foil (be sensible, keep it away from the contacts at the end of the
            tube :-) and fix your wire mesh across the front of that. not only does it
            protect the tube, but it reflects back some of the lost light from the back
            of the unit. Handy if youre using these along the front of a stage, as
            then the audience doesn't glow...

            BTW, BnQ also sell UV tubes, but they only had 2 foot ones in stock when
            I looked, so I can't get a price.

            I would also recommend phoning round theatrical suppliers as well as
            lighting shops (if you havn't already) they tend to be a little cheaper
            because of the volume that they shift...

            Erm, I think thats it from me for now.

            -Paul
            www.lpbk.net - top weekend, report comming by lunchtime
          • Charlie Hull
            ... also, if you use a sensible diameter of guttering/plastic waste pipe you can effectively build a case for the tube out of it - you can get end caps for the
            Message 5 of 17 , Oct 8, 2001
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              > The slinky idea is good. Another option is to mount a length
              > of guttering
              > on the tube holder (behind the tube) which has been carefully covered
              > in silver foil (be sensible, keep it away from the contacts
              > at the end of the
              > tube :-) and fix your wire mesh across the front of that.
              > not only does it
              > protect the tube, but it reflects back some of the lost light
              > from the back
              > of the unit. Handy if youre using these along the front of a
              > stage, as
              > then the audience doesn't glow...

              also, if you use a sensible diameter of guttering/plastic waste pipe you can
              effectively build a case for the tube out of it - you can get end caps for
              the tubing, and then cut an oval window from the front to let the light out,
              put the bit you cut out on hinges and hey presto, a portable flightcased UV
              tube. Ra Ra Zoo had some very similar ones a few years back that a friend of
              mine bought - they also used some medium density foam to make small (1 inch
              width) pads between the tube and the casing to add extra support rather than
              just relying on the ends.

              Hope this helps.

              Charlie

              >
              > -Paul
              > www.lpbk.net - top weekend, report comming by lunchtime
              >
            • Richard Loxley
              ... Found this the other day when troubleshooting the fluorescent light in my kitchen (which has just gone on the blink). Search for black light :
              Message 6 of 17 , Oct 8, 2001
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                Paul Seward wrote:
                >
                > There are (in general) 2 types of UV light source. UVA and UVB. I
                > can't stress the diferences between them enough. (Unfortunately
                > I can't remember which was bad :-) Anyway, one is the type of light
                > emitted by the UV tubes in tanning beds which is bad for the eyes
                > (not to mention the skin cancer risks) this is the bad one (from memory
                > its UVA but I could be wrong)

                Found this the other day when troubleshooting the
                fluorescent light in my kitchen (which has just gone
                on the blink). Search for "black light":

                http://www.thekrib.com/Lights/fluor-goldwasser.html


                - Richard
              • nicole taylor
                hi everyone... sorry to post again on this but at the weekend we were let down by a couple of acts, leaving us with...well, not many. if you have an act, or
                Message 7 of 17 , Oct 8, 2001
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                  hi everyone...

                  sorry to post again on this but at the weekend we were let down by a
                  couple of acts, leaving us with...well, not many.

                  if you have an act, or know someone who has, then drop min or myself a
                  line and offer.
                  please.

                  it's a friendly convention...the act doesn't have to be
                  super-polished, with lovely music and spangly costumes etc., just
                  something you'd like to show off in an environment where you won't get
                  crucified for it.

                  for those of you not even sure if you want to attend the convention -
                  there's somewhere to stay on saturday night for absolutely everyone,
                  and if you want to , you can juggle all night, cause the hall's not
                  shutting (hurrah!)

                  hope to see you all there

                  nicole
                • Paul Seward
                  ... Erm, did you have me down as a definate yes? (I vaguely remember making some kind of offer) If so I ll have to drop out too... Theres a freeparty going
                  Message 8 of 17 , Oct 8, 2001
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                    >>> nicole@... 10/08/01 03:17pm >>>
                    >
                    >sorry to post again on this but at the weekend we were let down by a
                    >couple of acts, leaving us with...well, not many.

                    Erm, did you have me down as a definate yes? (I vaguely remember making
                    some kind of offer) If so I'll have to drop out too... Theres a freeparty going
                    off near Bristol, and what with all the lovely friends I made at the last one I
                    feel inclined to go to that instead.

                    No offense, Durhams a lovely convention, but the freeparty will cost me
                    less than £20 and the train fare to Durham is £60 with a railcard and I'm
                    not even sure mine is still valid...

                    Financially it makes more sense for me to miss out on Durham this year
                    and spend the weekend off my face in a field instead... :-)

                    Sorry peeps... I will however be at Manchester this weekend...

                    So who'se joining Mike and Myself in the Marble for the
                    Manchester-Fringe-Drinking-Binge convention on Saturday? (Starts
                    11:30am Saturday, with some sort of pretense at a bar tricks workshop
                    if last year is anything to go by)

                    -Paul
                    www.lpbk.net - It's just one thing after another
                  • mini
                    sum total of acts for Durham now rests at 4! is anyone out there interesteded in doing somethign for us? On Mon, 08 Oct 2001 15:17:44 +0100, you wrote: - hi
                    Message 9 of 17 , Oct 8, 2001
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                      sum total of acts for Durham now rests at 4!

                      is anyone out there interesteded in doing somethign for us?




                      On Mon, 08 Oct 2001 15:17:44 +0100, you wrote:

                      ->hi everyone...
                      ->
                      ->sorry to post again on this but at the weekend we were let down by a
                      ->couple of acts, leaving us with...well, not many.
                      ->
                      ->if you have an act, or know someone who has, then drop min or myself
                      a
                      ->line and offer.
                      ->please.
                      ->
                      ->it's a friendly convention...the act doesn't have to be
                      ->super-polished, with lovely music and spangly costumes etc., just
                      ->something you'd like to show off in an environment where you won't
                      get
                      ->crucified for it.
                      ->
                      ->for those of you not even sure if you want to attend the convention
                      -
                      ->there's somewhere to stay on saturday night for absolutely everyone,
                      ->and if you want to , you can juggle all night, cause the hall's not
                      ->shutting (hurrah!)
                      ->
                      ->hope to see you all there
                      ->
                      ->nicole
                      ->
                      ->
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                    • Richard Loxley
                      ... B&Q Warehouse (Longwell Green, Bristol, if you re interested) has 4 black light tubes in stock for £7.99. Also standard fixtures including ordinary 4
                      Message 10 of 17 , Oct 8, 2001
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                        Paul Seward wrote:
                        >
                        > BTW, BnQ also sell UV tubes, but they only had 2 foot ones in stock when
                        > I looked, so I can't get a price.

                        B&Q Warehouse (Longwell Green, Bristol, if you're interested)
                        has 4' black light tubes in stock for £7.99. Also standard
                        fixtures including ordinary 4' tube for about the same price.
                        They sell caged fittings too (no price, but would guess around
                        the £15 mark compared to other stuff they were selling).

                        So if you can get the whole lot for £20 you're probably
                        getting a reasonable deal, but not spectacular. £30 is
                        definitely a rip-off.


                        - Richard
                      • Paul Seward
                        ... /me is off to Longwell Green (I was at the other BnQ Warehouse in Bristol :-) as the 2 ones they had were the thick ones I m after.... Yay! I can have
                        Message 11 of 17 , Oct 9, 2001
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                          >>>> juggle@... 10/09/01 02:08am >>>
                          >Paul Seward wrote:
                          >>
                          >> BTW, BnQ also sell UV tubes, but they only had 2 foot ones in stock when
                          >> I looked, so I can't get a price.
                          >
                          >B&Q Warehouse (Longwell Green, Bristol, if you're interested)
                          >has 4' black light tubes in stock for £7.99. Also standard
                          >fixtures including ordinary 4' tube for about the same price.
                          >They sell caged fittings too (no price, but would guess around
                          >the £15 mark compared to other stuff they were selling).
                          >
                          >So if you can get the whole lot for £20 you're probably
                          >getting a reasonable deal, but not spectacular. £30 is
                          >definitely a rip-off.

                          /me is off to Longwell Green (I was at the other BnQ Warehouse in Bristol :-)
                          as the 2' ones they had were the thick ones I'm after....

                          Yay! I can have flashing, dimmable UV in my room again!!!

                          (If anyone would have a use for a UV tube that starts immediately (no
                          flicker, no delay on switch on) that can be dimmed by any dimmer that
                          can handle inductive loads... let me know and I'll draw up the details
                          of how to build one... and it'll only add about a fiver to the price of the
                          fitting :-)

                          -Paul
                          www.lpbk.net - what *was* I thinking?
                        • Richard Loxley
                          ... Well, I don t have a use for a dimmable fluorescent, but I m certainly intrigued. How do you do it then? - Richard
                          Message 12 of 17 , Oct 9, 2001
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                            Paul Seward wrote:
                            >
                            > (If anyone would have a use for a UV tube that starts immediately (no
                            > flicker, no delay on switch on) that can be dimmed by any dimmer that
                            > can handle inductive loads... let me know and I'll draw up the details
                            > of how to build one... and it'll only add about a fiver to the price of the
                            > fitting :-)

                            Well, I don't have a use for a dimmable fluorescent,
                            but I'm certainly intrigued. How do you do it then?


                            - Richard
                          • Paul Seward
                            ... I ve just sat down and tried to work it out from memory, and I can t do it reliably so I ll dig out the scematic when I get home. But the basic principal
                            Message 13 of 17 , Oct 9, 2001
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                              >>> juggle@... 10/09/01 10:56am >>>
                              >Paul Seward wrote:
                              >>
                              >> (If anyone would have a use for a UV tube that starts immediately (no
                              >> flicker, no delay on switch on) that can be dimmed by any dimmer that
                              >> can handle inductive loads... let me know and I'll draw up the details
                              >> of how to build one... and it'll only add about a fiver to the price of the
                              >> fitting :-)
                              >
                              >Well, I don't have a use for a dimmable fluorescent,
                              >but I'm certainly intrigued. How do you do it then?

                              I've just sat down and tried to work it out from memory, and I can't do
                              it reliably so I'll dig out the scematic when I get home. But the basic
                              principal is that you use a permanent 5V feed accross the heaters in
                              the end of the tubes envelope to preheat the gas in the tube thereby
                              partially ionising the gas in the tube so that when you apply your
                              switched mains voltage to the tube, it strikes immediately. (Eliminating
                              the need for a starter) When used appropriately with a zero crossing
                              dimmer circuit (Such as those found in stage lighting dimmers for example)
                              you can dim the tube.

                              We used to use the same circuit to run cheap "neon effect" disco
                              lighting made from flourescent tubes and lighting gells in the lighting
                              rig at Aston Uni many moons ago, and very effective it was too...

                              I'll post up a scan of the schematic to the files area or something when
                              I find it.

                              -Paul
                              www.lpbk.net - Hmm....
                            • Paul Seward
                              ... OK then. Just for you Richard, I put together https://www.lpbk.net/misc/flashing_tube.html I don t think I missed out any important details. Oh, I did
                              Message 14 of 17 , Oct 10, 2001
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                                >>> juggle@... 10/09/01 10:56am >>>
                                >
                                >Well, I don't have a use for a dimmable fluorescent,
                                >but I'm certainly intrigued. How do you do it then?

                                OK then. Just for you Richard, I put together https://www.lpbk.net/misc/flashing_tube.html
                                I don't think I missed out any important details.

                                Oh, I did forget to mention that not all flourescent tube holders come with
                                a suitable ballast... Some of them have funny electronic ballasts that have
                                all sorts of gubbins in that will cause this cirucuit grief. However from what
                                I remember, these have more than 2 wires comming out of them, so theyre
                                quite easy to spot! :-)

                                -Paul
                                www.lpbk.net - more stuff than I should really crank out.
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