Slashdot Mirror
Lightsource for DIY LCD Projector
xpndsprt asks: "I'm trying to develop my own projector (i've been reading DIYAudio forums for a while and finaly decided to put together my own), but it seems that people are having problems with light source. The Slashdot crowd seems to always have interesting answers to problems at hand, so to get to the point: Does anyone know of a powerful lightsource (200w+) which would produce a high temperature light (5000K+) and would not heat up too much (ppl seem to be using mag.Hylide bulbs, but those seem to heat up tempreture in the room by about 10F. Xenon lights are out of question, since too hot and not bright or white enough. If someone could help, it would be greatly appreciated."
LED lights are too dim.
its hard to get enough in a small enough space to do much good, and you would require at least 75-150$ worth to get enough light to use the projector in daylight.
IF you had enough space, you could group 150-200 white LEDs in a tight slightly curved mount the same arc as a compressing lense , then focues that light onto a diffuser, spread the beam to a freznel the size of your LCD screen and hope for the best.
this would get expensive as a set of high quality lenses would be in the 100$ price range and 200 LEDs would run about $300, plus time.
though youre light source would be good for 150,000+ hours, and would just slowly degrade when the LEDs got old and failed.
and powering 200LED lights would not be too difficult, with the use of a PC power supply you can have 3.3/5/8.3/10/12/15.3/17/20.3/24 volt outputs , enough to drive many arrays of LED lights without any problem.