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Heatsink with 90 degree bend like Thermalright HR-05? - Page 3

post #21 of 23
Thread Starter 
600

the LED looks like this. I did not order it from Dealextreme however, the one I ordered is 33mm x 22.5mm x 4.3mm (amazing right something that small does so much light?)

@windfire, wow you are amazing. Didn't know they went that cheap, the cheapest I found was $300+ for the bulb. However in the picture it's a different assembly than mine. I would most likely have to hack that one into the original housing. Also the lamp wiring is welded on I blieve (ordinary solder would melt off during operation). I'd also need to buy thermal culk to seal it up.

However I'd still pick the LED because it has way longer life span (assuming I can cool it properly (50,000 hours vs 2000 hours)). LEDs also has a higher color temperatures and can produce better white light (which I hope results in better picture). And I just like to play with electronics smile.gif. In Canada, Hr-05 is $20. The bulb from ebay was $34 with a 50w driver.

I would have also went for a 100w one but considering this projector was originally rated only 1500LM, 100W seems to be overkill (the 50W does 3500k-4000LM). I also have to account for the LCD permeability has a large amount of light is lost once it reaches the LCD assembly in the projector.
post #22 of 23
Quote:
Originally Posted by Captain Han View Post

600
but considering this projector was originally rated only 1500LM, 100W seems to be overkill (the 50W does 3500k-4000LM). I also have to account for the LCD permeability has a large amount of light is lost once it reaches the LCD assembly in the projector.

uhm... if the projector was rated for 1500LM and you are putting a 3500LM unit in there, it sounds like you are going have nothing but a whiteout screen.

the LED plate looks like it does not have a load bearing structure which means you cant put too much pressure on there in a pressure mount. you'll have to construct a mount system which takes the pressure off the led plate but maintain a good contact with the led for heat transfer. that's not going to be easy without bending/warping the led.

the hardest part of your project is constructing a mounting system to carry the weight of the heatsink IMO
post #23 of 23
Thread Starter 
well the project is rated 1500LM at the output, which means internally the lamp is much brighter. Since the light has to go past mutiple mirrors, DMD and Lens it'll lose a lot of the light. The DIY projector projects that uses ordinary monitor LCDs loses about 90% of light. But a DLP projector using a DMD or DLP chip which reflects light instead so it keeps most of the light. I dont know the exact values, but at each mirror, lens, and DMD you lose about worst case 10%. There are 2 mirrors, 1 DMD and 1 projection lens. I figure 40%-50% intensity loss is a good ball park, which will net me about 1500LM, if not better.

This is all speculation however. If it doesn't work I'll just use the light to temporary blind some homeless people.
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