Hello Everybody

Just want to know... If I replace my Halogen bulb in my OHP with a Metal Halide, the cooling already in place will be more than enough to cool the new bulb right. 275W Halogen Bulb replaced with 150W POWERBALL HCI-T from Osram?

/Daninino

I don't think cooling will be too much of a problem 150W MH will be MUCH cooler than a 275 halogen. You will need a ballast for the metal halide lamp...

cheers,
gs

That sounds Peachy

I was thinking about ripping the old REALLY loud fan and replacing it with a much quieter 80mm or 120mm computer fan eg: Noiseblocker BlackSilent XL2 Rev. 1.0 1400rpm 57,7cfm I think that would Suffice and I don't think the fan in the OHP is moving much air anyways its just LOUD.

And I know about the ballast

And it will be great not being Cooked while watching a movie

i'm new to all this but wiil a 150w metal halide bulb be brighter than a 250w halogen at the moment i have a 250w halogen ohp light rig, I havent finished building my pj yet but will it be strong enough?

well, the overall lumen output of a 150W metal halide will likely be greater than a 250W halogen, but most halogens come with an integrated reflector, so the useable light from a 250W halogen may actually be higher... depends on the reflector design for the 150W metal halide lamp.

cheers,
gs

If you have an average LCD panel (4-5% transmissive), then a 250W halogen probably isn't bright enough no matter how good of a reflector or precondenser it might have.

I would consider a 400W halogen as an absolute minimum to get good results.

It should be comparable to a 200W Metal-Halide in terms of lumen output - without regards to the rest of the light engine/reflector effectiveness.

It appears that elken is getting his excellent results with his 150W MH because he has such a good light engine around it: (reflector and precondenser).