DIY Video Projector Part II

[ace3000_1]

I haven´t tested this and I don´t plan to do it either, I don´t have $2000 to spend on this, but if you have, please tell me if it works. In the future when the price have decreased, I think this will be an incredible lightsource, 100000 hours lifetime, you don´t live forever but they do.

Yeah i agree with no frensel its fine, but the only problem that may acur is the hotspoting from each led through the lcd, if the angle is wide enough on each led we may not get this effect.

Just to add to the thoughts though, i can get a frensels lens here that is actually manny frensels in the one sheet, from memory they are 1 inch across so maybe they would work to create a large evenly lit backlight.

If i had the money sure id be in the testing too, but when i can buy a metal halide setup for way less , why bother lol, yeah yeah ok heat and life ect but still i wouldnt pay 2k for a light source.

I got my light today btw and thanx, it got here in 1 peice.

Trev

[diylabs]

Originally posted by ace3000_1
but still i wouldnt pay 2k for a light source.

Indeed - $2k would be much better speant on a xenon system like movie theater light booths use, though it's been a while since I priced them (maybe there not as expensive anymore?)

[ace3000_1]

Indeed - $2k would be much better speant on a xenon system like movie theater light booths use, though it's been a while since I priced them (maybe there not as expensive anymore?)

Duno about going down in price, all the things i see these days go up in price lol.

Xenon would be nice but then we have the issue of heat, more so then metal halide unfortunatley, but yeah xenons are nice.

Trev

[XanderSnyder]

i was thinking of using a xenon for a while till i talked to my roomate. he is a theater projectionist so he took me up to the booth and we looked at the projectors. There is absolutly no way we could use even a smaller xenon bulb, 1) the heat is much much to high (and the fact that if you get hand oils on them they will explode ) and 2) the power required to run a xenon bulb would cause your power bill to skyrocket. Ive currently been looking at using the 400w HQI bulb from alan (so far with the psyudo ace/t800 and my design it should work quite well, i cant wait till ace releases his design so i can use some of his design ideas (i dont care how much his plans cost I WANT THEM!!!! lol)

X

[DEDan]

I use the xenon bulbs in surgical illuminators at the hospital that I work at. Heat is a major problem. On the higher wattage ones, there is more heatsink in the bulb area than bulb. And one finger print on the quartz, and KABOOM!!

[Altec]

Originally posted by mathias
A 75W Halogen PAR30 30 degrees give 2400 cd. I if you change that 75W bulb inside the reflector with a 150W-250W HQI, it will give much much more. Lumens is not used with reflectorbulbs.

Not true really. ENH is ansi spec for a 250watt TUNSTEN Halogen bulb with integrated IR UV filter 25o mr-16 refletcor. They give lumen ratings though nto easy to find I had to search. TWO as a matter of fact. One for filiment. One for focused beam of reflector. ENH, is 15,000 lumens (at filiment) 65% relative brightness (beam light) 9,750 lumen beam. Not candles. All pj bulbs use IR/UV dichrotic refelctors to remove heat. Not sueing one forces us to use hyper cooling and have hot panels. I totally agree with ya on that. I too after about 3 years (was "tinker" at first here) have done NOTHING but play with light engines. Sad as that is. I foudn out lots of stuff. Very interesting and major payoffs. My brightness is nothing even compairable to the original images I got. LOL. I can get a tiny 50watt EXT bulb to work with a 5" panel, have two windows without blinds on them shinning light in, 4 40watt bulbs on and still see a Image! With lights off its pretty good-wouldnt WATCH it though. Was a test of some ideas I had and I need a low watt non blinding mr-16 reflector bulb to do it. I wouldnt think about actually desinging around it. LOL. The 250 tungsten halo is for that. I also found mr-16 to be a key reflector. I have also used 2 bulbs at once with good output useing them. A 2" diameter reflector is really controlable. One is still best as no glare that way. If two-must use glare filter.

Also if anyone interested. I found a chart of what o beam is what size at said feet. Nice to know how big beam of light is. I scaled it down to inches even. Mine is 5.6" FD for ENH. So beam smallest there. Then goes back up. Good spot for removing heat with my little setup.

[mathias]

I really don´t understand what you mean ? I hope you or someone else can explain this.

Here is some exemple what the lumens output of some bulbs are:
50W 12V Halogen 4000h 930 lm
100W 12V Halogen 4000h 2400lm
250W 24V xenon-halogen 50h 10000lm
400W 36V xenon-halogen 50h 14500lm
150W HQI 12000h 12000lm
250W HQI 12000h 20000lm

Sure you get a brighter beam with a reflector, but not more lumens. When you use a reflector the light beams concentrates in one direction and light what goes in one direction is measured in candels not lumen.

If you put a 1000lm bulb in a reflector and then change it to a 20000lm bulb, which is brightest ?

[ace3000_1]

Who said we cant retrofit out a pro projector with a cdm-t bulb, i have and it works fine.

Trev

[ace3000_1]

Here is the old bulb, im going to drop it off of my balcony just to see how much of a bang they actually will make lol, the arc size on this old fellow is 6mm, and is metal halide.

Trev

[chasse]

Is the beam wide enough to cover a LILLIPUT complety at a short distance.(8 or 9 inchs).The new comercial projector have a smaller hole for the lamp and you cant retrofit a cdm in it.