[SML] LED Shadow projectors

[Jon Lagerquist]

While setting up a pancake breakfast this morning for Scouts I realized
that the LED lights cast a nice crisp shadow. The particular units have
what seems to be a single emitter as opposed to ones that have lots of
emitters. These are pretty run of the mill big box store units.

Jon

On 4/13/2018 8:37 PM, jdunfee12--- via Stagecraft wrote:
>  illuminati500 via Stagecraft <stagecraft at theatrical.net> wrote:
>> There is, of course a perfectly good shadow projector lamp Its cheap 
>> to make, ...snip.. Its the compact filament incandescent of course,
> 
> I think the attraction of the LED, especially the 5mm traditional shape,
> is that they are little spotlights unto themselves.  It was easy to
> think they would just increase the power of those little guys, perhaps
> only scaling them up a bit in size.  But, temperature is the LED's worst
> enemy, much more so than the incandescent.  So, the higher power ones
> went to the COB design, with the large disk that the light emits from.
> 
> But, some have built things like the 1000w equiv. Watercooled LED Sun
> Blaster.  However, I don't know how large the ... I don't know the term,
> but I am interested in the apparent aperture size from which the light
> emits.
> 
> For shadows on the scale of an entire stage, I can see how a projector
> bulb would be a good choice.  Though, the output beam spread of a
> projector itself is probably too narrow.  I have never tried to power up
> a bulb from a projector. I know some are incandescent, which would be a
> fairly easy hack.  The discharge lamp kind are something else entirely.
> 
> -Joe
> 
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-- 
Jon Lagerquist
--