How would this work out?

AustynSN · 10th April 2005, 08:03 AM

Hi. I was looking at the different lamp types here

http://www.atlaslighting.ca/findmybu...d_gallery.html

What I was wondering was this. For the lamps that already have a reflector built in (on this list, the PAR-38, PAR56/64 or R types), can they be found in Metal Halide form, and if so, would they work well in a projector?

Thanks for any help and replies.

boris333 · 10th April 2005, 10:15 PM

http://cgi.ebay.ca/ws/eBayISAPI.dll?...371381085&rd=1

ancorp · 10th April 2005, 10:30 PM

How can that 400 watt bulb pump out over 1.5million initial lumens?

Cheers,
Alex

Squalish · 11th April 2005, 10:32 AM

It can't, they were (ahem) smoking something when they wrote the description.

What they intended to write is a false representation of the output of the lamp at 151,000 lumens. The lamp puts out a beam rather than being an omnidirectional point source, and the lumen number takes into account their reflector. While perfectly good for growing pot, the optics of the reflector make it somewhat questionable for projector use.

To answer the thread starter's question: It may be possible to get an even picture out of a PAR or ellipsoidal bulb, but you're gonna need to do some experimentation to find out. These were designed for lighting, not for projection. Integral ellipsoidal reflectors form the bulk of lamp designs for commercial projectors, but they're specially designed short arc beasts of a different color.

Make sure that you don't skimp on the cooling, though - aluminized glass like this (unless it's marked dichroic) reflects heat just as well as it reflects light.

10th April 2005, 08:03 AM	#1
AustynSN diyAudio Member Join Date: Nov 2004 Location: Kansas	How would this work out? Hi. I was looking at the different lamp types here http://www.atlaslighting.ca/findmybu...d_gallery.html What I was wondering was this. For the lamps that already have a reflector built in (on this list, the PAR-38, PAR56/64 or R types), can they be found in Metal Halide form, and if so, would they work well in a projector? Thanks for any help and replies.

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10th April 2005, 10:15 PM	#2
boris333 diyAudio Member Join Date: Apr 2004 Location: .	http://cgi.ebay.ca/ws/eBayISAPI.dll?...371381085&rd=1

10th April 2005, 10:30 PM	#3
ancorp diyAudio Member Join Date: Jun 2004 Location: Vaughan, Ontario (near Toronto)	How can that 400 watt bulb pump out over 1.5million initial lumens? Cheers, Alex

11th April 2005, 10:32 AM	#4
Squalish diyAudio Member Join Date: Aug 2003 Location: Sector ZZ9 plural Z alpha	It can't, they were (ahem) smoking something when they wrote the description. What they intended to write is a false representation of the output of the lamp at 151,000 lumens. The lamp puts out a beam rather than being an omnidirectional point source, and the lumen number takes into account their reflector. While perfectly good for growing pot, the optics of the reflector make it somewhat questionable for projector use. To answer the thread starter's question: It may be possible to get an even picture out of a PAR or ellipsoidal bulb, but you're gonna need to do some experimentation to find out. These were designed for lighting, not for projection. Integral ellipsoidal reflectors form the bulk of lamp designs for commercial projectors, but they're specially designed short arc beasts of a different color. Make sure that you don't skimp on the cooling, though - aluminized glass like this (unless it's marked dichroic) reflects heat just as well as it reflects light.

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