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  • Svartalf commented on claudiopolis's instructable LED Projector Lamp v.2.01 year ago
    LED Projector Lamp v.2.0

    Heh... The grounds for the premise is solid, but your premise is wrong.http://www.projectorreviews.com/projector-categori...Most of those don't have Laser LEDs... Your premise fails on a few fronts. 1) 20k Lumens == 20k Lux == 20k Candellas. 2) The emitter source for the high pressure mercury arc is NOT constrained to 20 degrees, but rather 360- which makes the Candellas without the proper lumiary assembly down to 3k Candellas.3) A similar "proper" lumiary assembly can be made to constrain the LED Emission profile to about 20 degrees.4) With "1", all things being equal, if you constrain the light to 20 degrees of emission profile with low losses, X lumens *DOES* equate to X candela.5) once you get past the 100 lm/watt range, you're in the domains beyond even UHP ...

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    Heh... The grounds for the premise is solid, but your premise is wrong.http://www.projectorreviews.com/projector-categori...Most of those don't have Laser LEDs... Your premise fails on a few fronts. 1) 20k Lumens == 20k Lux == 20k Candellas. 2) The emitter source for the high pressure mercury arc is NOT constrained to 20 degrees, but rather 360- which makes the Candellas without the proper lumiary assembly down to 3k Candellas.3) A similar "proper" lumiary assembly can be made to constrain the LED Emission profile to about 20 degrees.4) With "1", all things being equal, if you constrain the light to 20 degrees of emission profile with low losses, X lumens *DOES* equate to X candela.5) once you get past the 100 lm/watt range, you're in the domains beyond even UHP mercury vapor for luminous intensity.Now, had you said it was "easier" to accomplish the focusing because of UHP being a point source for the light and the LED's being "more spread out", I'd have bought the statement in spite of the handwavium you're putting out. However, since you went where you went...I need chest waders for it.LED's have a potential to be made as good or better with performance levels exceeding 200lm/watt now with the right luminaries. It may or may not be that you can retrofit a projector gracefully with such gear, but it's worth trying. The reason why they have as many "fails" as we seem to have (with a few recent successes, albeit ugly as hell) is that it's harder to get the focusing you need to keep the light going in the right directions for projecting. It's not that it's impossible (you're seeing 800+ lm projectors in that list...)- it's difficult.I'm happy for the challenge.

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