recent MVB data
- Hi, "XrayXray2003"
(please sign your emails, so we have at least a name for you :) )
There are a large number of mercury vapour lamps now on sale across the
world; have you any brands in particular you'd like to know about? What
country are you from?
The best UVB meter depends on exactly what you want it for.
Most people keeping reptiles find a Solarmeter 6.2 ideal for checking
the output of their lamps and monitoring their longterm decay. It has
proven sturdy, reliable, and has the best resolution (down to 1 uW/cm2)
of any affordable hand-held scientific instrument. Also, over the last
few years quite a large database of information has built up of
readings taken with this instrument for almost all reptile lamps
currently on sale, so you have a good way of checking how your sample
compares with others of that brand.
However, if you are interested in comparing lamps one brand against
another, or with the sun, or researching what UVB reptiles get in the
wild, then this may not be the meter for you. Like all broadband UVB
meters, it takes in the whole UVB range and the upper UVB wavelengths,
included in the reading, are not relevent for vit D3 synthesis. Their
inclusion also means that the SPD (spectral power distribution) of
different brands of lamp, and the sun, may be quite different. 100
uW/cm2 from one lamp will not have the same vit D3-producing ability as
100uW/cm2 of a different brand or type. So one cannot use this meter to
compare one brand with another, except in the most general terms.
Recent research has shown that one very good way of doing this is to
measure the UV Index of the light from a lamp or the sun, and a paper
recently appeared in the Chicago Herp Bulletin describing the
Solarmeter which measures UV Index (Solarmeter 6.5) and one the
readings from which can be converted to UV Index by multiplying by a
correction factor (the Solarmeter 6.4). The researchers showed that the
UV Index readings from these Solarmeters are also a good indication of
the ability of any lamp (regardless of brand or type) to enable vitamin
The only problem with these meters is that the amount of UVB radiation
in the D3-producing wavelengths, from many lamps, especially
fluorescent tubes, is so small that it is really stretching the ability
of any hand-held instrument to register it. Hence with these types of
lamp, readings with a Solarmeter 6.5 at basking distances may wobble at
the sensor's limits (UV Index 0.1 - 0.2)
UV Guide UK will shortly be changing over its main focus to the
reporting of the UV Index of all lamps and the sun, using the
However, only a handful of people in the reptile world own these, so UV
Guide UK will still provide readings of the Solarmeter 6.2 since this
is very widely used worldwide by hobbyists, zookeepers, vets and
researchers in the field. However, I believe the UV Index meter will
soon come into its own.
Hope that helps!
--- In UVB_Meter_Owners@yahoogroups.com, "xrayxray2003" <xrayxray@...>
> anyone know where i can get up to date MVB info?
> what's the best UVB meter?