Collaborative LED Light Source Experiment

[Just In KY 2002]

I've always used www.besthongkong.com ($.15-$.41 per led) for my white, blue, and amber leds for cars. I've even made volunteer firefighter emergency lights with these.

My grandfather passed away over the summer and was a photography fanatic. He has all kinds of lenses/cameras/slide projectors/film enlargers/ film projectors that we have to sell for the estate.

I took an old kodak slide projector and had a decent picture on the wall with a 3x3 led cluster of the 14,000mcd white leds. I put a video camera 3" lcd screen in place of the slide, and had this projected on the wall as well, but no where near usable. I'm going to play around with some of the other stuff at the estate, and maybe end up using a film enlarger. I'll be sure to keep everyone posted. I'm determined to find a way.

 

[mikyd1954]

well, I'd recommend using the smallest beam spread angle LEDs you can find,this is assuming you will not use a collimating fresnel, though I'm pretty sure using a collimating fresnel is useless too...unless you could use one small fresnel(with the LED at the focus) for each LED... you can simulate this with a laser pointer...its pretty interesting playing with a laser pointer and a collimationg fresnel... you can see right where the light ray will hit the front of the box ....and unless the light source is at or near the focal point of the fresnel, it jst doesn't go anywhere near the triplet.... leds will work, but for now the right ones(very narrow beam spread..I'd say 5 degrees is best and right next to the LCD, no fresnel) are just too expensive, but give it about a year ;-)