Re: [diy_3d_printing_and_fabrication] Re: dlp-like stripe projection
- Mark wrote:
> Efficiency is the ratio of useful energy out to energy in. Given that most of the spectrum from the HP lamp is not useful one has to question the claims of high efficiency.OK, I was comparing the UHP projection bulbs to the 100 W incandescent
> --- In firstname.lastname@example.org, Jon Elson <elson@...> wrote:
>> Graham Stabler wrote:
>>> So the first question is, do projectors give out 100W of optical
>>> power? A 100W light bulb certainly does not, given the heat I would
>>> expect losses to be very high but I don't know.
>> No, they don't. First, although the HP lamp is more efficient, it still
>> gives off a lot of
>> IR and convective heat.
light bulb, as
Graham mentioned. I am sure the UHP lamps ARE more efficient than plain
incandescent bulbs. Those produce a HUGE amount of IR, and that is why
projectors that used them used dichroic mirrors to dump the heat. The
produce much less IR, so that helps the efficiency.
- With lasers and electomechanics?
--- In email@example.com, Jon Elson <elson@...> wrote:
> Michael Couch wrote:
> > What if you used it as is and printed the pages four or more times a piece?
> Can you return to the register position with 21 um accuracy?