DIY Video Projector Part II

[slize]

no its not its 6,66 lumens

[slize]

ooopsss

yes u are right: here is the formula

so 10000mcd * 15angle --->>> 150000 m lumens

so 150 lumens is right...

but even then we are just talking about 150!!! lumens and is still a long way too 35000 lumens...

and the leds posted here had max 7500 mcd that would be 112,5...

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Originally posted by noodles
A Luxeon Star LED has about 660 candela. And if candela = lumens... then well, you know the rest.

so the luxeon star led would have about 10000 lumens, but i think the viewing angle is the problem. u won't be able the light up the whole lcd.

there would start again with a small lcd with good resolution...

[slize]

What I ordered is a Luxeon Star/O LED, part number LXHL-ND94. I grabbed the datasheet from Luxeon's website, as well as a few other interesting documents. Let me give you the quick technical specs on this LED: Typical Candela on axis 660 Cd
Dominant wavelength 627 nm
Typical luminous flux 44 lumens <-----
Junction material Aluminum Indium Gallium Phosphide
Typical forward voltage (Vf) 2.95 V
Forward test current (If) 350 mA
Max. forward current 385 mA
Cost US $15


the link: http://www.bit-tech.net/review/82/

[noodles]

^ Yeah that's where I saw it.

I went to the Luxeon website and it says their most powerful light output of the Luxeon family is the flood. It consists of 12 or 18 emitters. With an 18-emitter white Luxeon Flood... the typical luminous flux is 325lm. I bet the price of these things is pretty high too...

But the best part is that it's low-heat which means you don't need noisy overheadprojector fans. And they last around 10 years, so you don't need to buy replacement bulbs. I'm sure when 10 years comes around though, commercial LCD projectors will be extraordinarily cheap... but whatever. It's not an easy or cheap task... but it's nice overall.

[verbose mustafa]

Actualy, luxeons are not low heat. You really need to have a heatsink when you run those things.

[noodles]

Ok... then I guess we can rule that one out then...

Is Metal Halide still the reigning king of projector lighting? What do they use in those commercial LCD projectors?

[verbose mustafa]

Well, that can be delt with, but at $40 for a 150 lumen 5 watt emmiter... thats a little pricey.

[slize]

no leds are not bad after all, may be in 2 years they have one that we can use...

but for now i would say MH bulbs are best for diy projectors... the hours about 2000h - 8000h depends on the model is ok. only problem is you need at least 400W and better 1000W what i heard... i am still waiting for my 400W MH bulb, then i can say more... MH lamps are ok in price (about 50-100$)

in projectors they use NSI bulb for example. don't ask me whats that exactly. all i know it is very expensive (about 400$ one bulb). they last 2000h and have a lumen output of 100.000+ with 250W. some are in a vacuum. i guess these lamps are so expensive because of their special producing

[prjctr_builder]

hi guys, i have a few questions and requests for you all. i want to install 50W Metal Halide bulbs into my cars headlights, so what i am looking for are two 50W MH bulbs and 2 ballasts that would power them. if anyone has any information on where i can get these items at a reasonable/cheap price, please let me know asap. my email: ikutuyev@sbcglobal.net thanks in advance

P.S. keep up the good work...

aleksey