my profile | my password | search | faq & rules | forum home

» Film-Tech Forum ARCHIVE   » Operations   » Film Handlers' Forum   » Using metal halide bulbs for film projection (Page 2)

This topic comprises 2 pages: 1  2

Author Topic: Using metal halide bulbs for film projection Matthew Bailey Master Film Handler Posts: 461 From: Port Arthur,TX Registered: Sep 2000 posted 05-13-2002 08:58 PM                     I am wondering if a homebuilt 1000 watt lamphouse using five 200 watt household bulbs either frosted or clear,preferably clear would work.  |  IP: Logged Randy Stankey Film God Posts: 6539 From: Erie, Pennsylvania Registered: Jun 99 posted 05-13-2002 09:24 PM                     I suppose you can do anything you want but using a bunch of bulbs like that is going to be a big hassle. You have to make a fixture to hold that many bulbs that won't overheat... won't blow a fuse... won't electrocute somebody... will put out light in the correct "pattern" for the projector (a cone-shaped beam)... and is still small enough to fit in your booth. There's the matter of the reflector... How are you going to make a parabolic (dish-shaped) mirror that has five holes in it for the bulb bases to go through yet still reflect light well enough to illuminate the screen? Sounds like too much trouble to me. But there's an old saying: "Nothing is impossible... Some things just take longer." *********** Well, Jason, I liked the job and the company was OK , however, being on the road for 6 days a week is bad enough but when you don't have any family to come home to at the end of it all you start to lose your sense of humor about things. I decided it was time to come back home. Now I work full time at the college where I was "moonlighting" before I left.  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 05-13-2002 09:47 PM                     I think you are wating your time re inventing the wheel You would require a cloverleaf style convergance lens to refocus the multiple lamps ( all of us who delt with the norleco horizontal xenon with that lens will testify to the grief it can cause if not properly aligned) With the vast amount of good surplus equipment out there I can't fathom a reason to go on this quest other than to attack some windmills  |  IP: Logged David Koegel Film Handler Posts: 55 From: Alexandria, VA Registered: Jun 99 posted 05-14-2002 07:50 AM                     Matthew had to have been kidding with his last suggestion  |  IP: Logged Matthew Bailey Master Film Handler Posts: 461 From: Port Arthur,TX Registered: Sep 2000 posted 05-15-2002 07:24 PM                     I suppose each of the five 200 watt bulbs would have it's own reflector &/or lens all of whitch would be converged onto the snood.  |  IP: Logged Evans A Criswell Phenomenal Film Handler Posts: 1579 From: Huntsville, AL, USA Registered: Mar 2000 posted 05-15-2002 07:57 PM                        It seems that if one were to attempt to use metal halide lamps for projection, it would be best to use a single 1500W bulb, since such a bulb produces 155000 lumens (at least they did in 1981 when I learned about various types of lights). Using such a lamp may require a special reflector. I'm really curious if such a lamphouse could be used effectively? 1500W metal halide lamps are the size used to illuminate most baseball and football fields these days. ------------------ Evans A Criswell Huntsville-Decatur Movie Theatre Information Site  |  IP: Logged

All times are Central (GMT -6:00)

This topic comprises 2 pages: 1  2

Printer-friendly view of this topic

Hop To: Select a Forum: Category: Operations -------------------- Digital Cinema Forum Film Handlers' Forum Large Format Forum Ground Level Feature Info, Trailer Attachments & REAL Credit Offsets Category: Community -------------------- Film-Yak Film Handlers' Movie Reviews The Afterlife Bob Maar's Joke-A-Thon Category: Classified -------------------- Equipment and Supplies Wanted/For Sale Help Wanted/Seeking Employment Category: System -------------------- Software Beta Testing Forum

The Film-Tech Forums are designed for various members related to the cinema industry to express their opinions, viewpoints and testimonials on various products, services and events based upon speculation, personal knowledge and factual information through use, therefore all views represented here allow no liability upon the publishers of this web site and the owners of said views assume no liability for any ill will resulting from these postings. The posts made here are for educational as well as entertainment purposes and as such anyone viewing this portion of the website must accept these views as statements of the author of that opinion and agrees to release the authors from any and all liability.