Hi, I have a NEC LT265 which misses lamp and color wheel.
I want to use a LED lighting system. I read the Elektor article about it, very interesting.
I'm now looking for the LEDs. I found on eBay many high power models which seem to be claiming absurd luminous flux values (like 1000lm for 20W blue LED...).
Which models (che cheaper the better 🙂 ) can I use in order to obtain a good color uniformity?
Does someone know the REAL flux value of the high power color LEDs (10, 20, 50 and 100W models) sold on eBay?
Thanks
I want to use a LED lighting system. I read the Elektor article about it, very interesting.
I'm now looking for the LEDs. I found on eBay many high power models which seem to be claiming absurd luminous flux values (like 1000lm for 20W blue LED...).
Which models (che cheaper the better 🙂 ) can I use in order to obtain a good color uniformity?
Does someone know the REAL flux value of the high power color LEDs (10, 20, 50 and 100W models) sold on eBay?
Thanks
You wont be able to focus 3 LED's into the light tunnel you will need to redo the optics...Possible but not easy.
Of course I'll adjust all the optics, I have no problem here. 🙂
It's the choice of the right LEDs that stops me... 🙁
It's the choice of the right LEDs that stops me... 🙁
Luxeon Rebels are super tiny and bright....Optics isnt my thing tho so best of luck there. For a DLP you would need 3 mirrors at 3 different angles to get the 3 colors focused properly. If the light dont hit the DLP chip at the correct angle it will never make it out of the lens.
You might be able to try a LCD projector prism to get the 3 colors in 1 direction then focus them to the light tunnel but expect alot of loss. Thats atleast how I would attempt it.
Best of luck
You might be able to try a LCD projector prism to get the 3 colors in 1 direction then focus them to the light tunnel but expect alot of loss. Thats atleast how I would attempt it.
Best of luck
thank you, the rebels are interesting, but I was thinking of using one big led instead of many little ones.
those three? Someone know their real lumen outputs?
BLUE 100W High Power LED 6000LM Energy Saving LED Lamp su eBay.it Electronic Components, Electrical Test Equipment, Business Industrial
GREEN 100W High Power LED 6000LM Energy Saving LED Lamp su eBay.it Electronic Components, Electrical Test Equipment, Business Industrial
RED 100W High Power 6000LM Lumen Energy Saving LED Lamp su eBay.it Electronic Components, Electrical Test Equipment, Business Industrial
6000 lumens are too good to be true. I think they might be 1000lm for the blue, 3500 for the green and 3000 for the red. Do you agree?
I'm not looking for efficiency, I only want a good illumination
those three? Someone know their real lumen outputs?
BLUE 100W High Power LED 6000LM Energy Saving LED Lamp su eBay.it Electronic Components, Electrical Test Equipment, Business Industrial
GREEN 100W High Power LED 6000LM Energy Saving LED Lamp su eBay.it Electronic Components, Electrical Test Equipment, Business Industrial
RED 100W High Power 6000LM Lumen Energy Saving LED Lamp su eBay.it Electronic Components, Electrical Test Equipment, Business Industrial
6000 lumens are too good to be true. I think they might be 1000lm for the blue, 3500 for the green and 3000 for the red. Do you agree?
I'm not looking for efficiency, I only want a good illumination
I have a set of those filters if you want them. The must be mounted at perfect 45 degree angles. The prism would be better. As far as the LED's you want to use. All those are is an array of little LED's that = the lumen output. You wont be able to focus more then the center part and will loose a bout 80-90% of the brightness. I would start with 1 Luxeon Rebel LED of each color and scale up from there. The best you will get is prob what I used on my LCD projector..The 3LED's with a 17* lens.
Also could those big led's even be pulsed fast enough with full on/off times to even work?
Also could those big led's even be pulsed fast enough with full on/off times to even work?
Well , my friend is working with LEDs right now (brightest ever etc.) , I don know about it much, but I gave - giving this projection thing a tought. Apparently DMD is unobtanium by normal means , so Im looking for alternate source, so maybe we can put that skill into use.
Hi, if you can, try reading the Elektor article about DLP LED modding (PM me if you want it); you'll see that it's possible (and relatively simple) even without dichros. As I'm coming here from the laser world I understand pretty well how to add colors using filters and beam splitters/combiners.
I found this: How many R,G,B LEDs for white
For a true white source (x=.333 & y=.333) I need 30.2% of red, 61.3% of green and 8.5% of blue.
Not too difficult to obtain. You won't need too many leds neither.
I was thinking about a way to combine colors and, at the same time, shape the beam as a rectangle. My idea consists in a multi-stranded fiber optic with an end round shaped (the one which collects light) and the other rectangular shaped (the output). Wisely mixing the wires at the output you'll obtain a good light source (even without using dichros or beamsplitters) 😀
If you can focus the light as the beam has little convergence (for example with a convex-concave lens set) you can achieve little losses.
@crazifunguy: you're right. How is your system composed? how many lumens it can give?
Thanks
I found this: How many R,G,B LEDs for white
For a true white source (x=.333 & y=.333) I need 30.2% of red, 61.3% of green and 8.5% of blue.
Not too difficult to obtain. You won't need too many leds neither.
I was thinking about a way to combine colors and, at the same time, shape the beam as a rectangle. My idea consists in a multi-stranded fiber optic with an end round shaped (the one which collects light) and the other rectangular shaped (the output). Wisely mixing the wires at the output you'll obtain a good light source (even without using dichros or beamsplitters) 😀
If you can focus the light as the beam has little convergence (for example with a convex-concave lens set) you can achieve little losses.
@crazifunguy: you're right. How is your system composed? how many lumens it can give?
Thanks
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Also one thing to note...many DLP projectors have 4 segments RGW and Clear. You need to measure the angles of the segments and calculate the times for each color including clear which is RGB all on. Read my infocus X2 post as I explored some of this there. I tried using LED and even a red laser. I also tried a 50W LED. With the 50W LED direct to the mirror that goes to the DLP I only saw maybe 3 lumens of Grey Scale Picture. With a smaller LED Luxeon X2 I was able to focus out about 5-7 Lumens.
I have read that PDF article....while proof of concept is possible It still is going to be extremely hard to get 3 seperate light sources focused to a combined parallel beam
I have read that PDF article....while proof of concept is possible It still is going to be extremely hard to get 3 seperate light sources focused to a combined parallel beam
Cool work!
The color wheel in my DLP is a 4 segments one which spins at 7200RPM (120Hz).
You can see it in this photo
Flickr Photo Download: NEC LT240 disassembly: step 7
I have to rebuild a case for the projector, so I have no problems of space (I can use even relatively long focal lengths). This is also the reason why I can use more LEDs than you.
For example, from led outputs I can make a small low-divergent beam using two lenses. I have to adjust distances unless I'll obtain a straight beam. I know it isn't so easy, mine is only an example.
Once you have a rather small low-divergent beam you can use the fiber optics as I explained in order to inject the RGB beam into a lightpipe (to better mix light) and then in the DMD.
I'm doing this because a friend of mine will give me a LT265 beamer which is working but is missing both lamp and color wheel (and case 😛). Unluckily I have no access to a 3LCD projector 🙁
The color wheel in my DLP is a 4 segments one which spins at 7200RPM (120Hz).
You can see it in this photo
Flickr Photo Download: NEC LT240 disassembly: step 7
I have to rebuild a case for the projector, so I have no problems of space (I can use even relatively long focal lengths). This is also the reason why I can use more LEDs than you.
For example, from led outputs I can make a small low-divergent beam using two lenses. I have to adjust distances unless I'll obtain a straight beam. I know it isn't so easy, mine is only an example.
Once you have a rather small low-divergent beam you can use the fiber optics as I explained in order to inject the RGB beam into a lightpipe (to better mix light) and then in the DMD.
I'm doing this because a friend of mine will give me a LT265 beamer which is working but is missing both lamp and color wheel (and case 😛). Unluckily I have no access to a 3LCD projector 🙁
Maybe I found good LEDs
High Power 10W~100W LEDs - Huey Jann Electronics Industry Co., Ltd.
100w for green and red, 50w for blue (in a ratio of 7:3,5:1). Once summed they can theoretically output more than 10 thousands of white lumens 🙂
Now I'll go with the beamer mod... which seems to be not so simple as planned, in particular because I have to imagine which sort of feedback the color wheel use XD
High Power 10W~100W LEDs - Huey Jann Electronics Industry Co., Ltd.
100w for green and red, 50w for blue (in a ratio of 7:3,5:1). Once summed they can theoretically output more than 10 thousands of white lumens 🙂
Now I'll go with the beamer mod... which seems to be not so simple as planned, in particular because I have to imagine which sort of feedback the color wheel use XD
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