black light use in theater

topic posted Thu, July 31, 2008 - 3:39 PM by  :::patti:::
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So I'm working on a show at my small non-profit theater. And we are wanting to incorporate black lights into the show. However, we have not much of a budget to work with and was wondering if anyone had any ideas on making this happen. The costume and set designer wants to use black light paint on the back drop and costumes. So we would need enough light to get the effect.

I'd appreciate any ideas that anyone has.

Thanks!
Patti
posted by:
:::patti:::
SF Bay Area
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  • Re: black light use in theater

    Fri, August 1, 2008 - 8:07 AM
    R80 doubled and the most powerful lights you can rent, UV light is notoriously inefficient and it takes some serious HID fixtures to do it properly.

    Alternately you can rent some HID (High Intensity discharge) fixtures (commonly known as Metal Halide) with either filter integrated into the lamp glass or a UV filter for the fixture. I'd say 1000 watts per lamp MINIMUM.

    Almost all these fixtures, even the high power ones are limited throw so keeping the fixtures as close to what you want to illuminate is ideal.
    • Re: black light use in theater

      Fri, August 1, 2008 - 11:38 AM
      Seriously saturated violets and purples like Rosco 49 do a pretty good job of mimicking blacklight. Get a few slightly different colors and experiment with what looks best on your set. You will have to use some pretty powerful instruments, so watch out for gel burnout.
  • Re: black light use in theater

    Sat, August 2, 2008 - 11:49 AM
    Since your in the SF I would check with Holzmuller Productions

    www.holzmueller.com/index.htm



    They rent different types of blacklite sources.

    Or any other theatre supply companies you can find.

    Filtering any sort of incandescent light is a waist of time as incandescent has almost no UV.

    If you don't want to rent then try to find inexpensive florescent blacklite fixtures and experiment
  • Re: black light use in theater

    Sun, August 3, 2008 - 4:37 PM
    BTW here are some options, I'm not guaranteeing that these fixtures still exist in production or rental....of course I operate with instruments that are older than some of the ppl on this tribe soo....its not to say you wont rent a fixture that hasnt been rehabbed a handfull of times over the past 30 years.... good luck. BTW this is from my notes, allot of it it manufacturer claims, your mileage will vary during actual usage there are only a couple products I can be bothered to use, UV flouro tubes are not one of them. Flouro tubes are for bathrooms and offices, Its cheap but the throw is really short, uncontrolled and best for halloween, small house parties and freaky costume sex at home.



    Altman UV-702 250 Watt 10-20' throw fixed focus

    Altman UV-703 400 Watt Fresnel UV Filter (adjustable fresnel) mileage varies on the throw

    Altman UV-704 Same as above fixed focus (interchangeable lense) the weatherproof variant

    Altman UV-705 Same as 703 10' lens

    American DJ BL-125D 125 watts Nice for black box, checking hotel room cleanliness and looking for scorpions outside your tent

    Theatre Effects BL90 250 Watts @ 110volts mercury vapour blacklight with UV filter. 5 minutes warmup, and must cool after dowse before restrike

    Theatre Effects BL91 400 Watts @ 220volts mercury vapor lamp with UV filter. 5 minutes warmup, and must cool after dowse before restrike

    Apollo Blacknight UV Black Light Cannon 400 watts @110volts

    Wildfire - WF-250(F)(WS)(S) Long-Throw 250-Watt, 100/120/240-Volt. Flood:60' throw, 90° field; Wide Spot: 80' throw, 50° field; Spot: 150' throw, 20° field. Metal-halide lamp

    Wildfire - WF-400E Long-Throw 400-Watt, 100/120/240-Volt. UV-A filter. External ballast. Throws of up to 50' at beam spreads of 20° to 40°. Has slot for gobos. Metal-halide

    Wildfire - WF-400S/F Long-Throw 400-Watt, 100/120/240-Volt. UV-A filter. External ballast. Throws of up to 60' at beam spreads of 8° spot to 59° flood. Metal-halide

    Wildfire - WF-401F Long-Throw 400-Watt, 100/120/240-Volt. UV-A filter. Throws of up to 100' at beam spread 115°. Metal-halide

    Wildfire - WF-600S/F Long-Throw 600-Watt, 100/260-Volt. UV-A filter. External ballast. Throws of up to 200' at beam spreads of 20° to 40°. Metal-halide

    Everything claims to filter out UVB & UVC, I dont burn from UV exposure but I wouldnt hang out in front of the more powerful fixtures without protection (eye and skin)., with the more powerful fixtures if your going to be working close to them make sure to take breaks regularly to relieve eye strain. Nowhere near as intense as looking at a welding spark but working in any single bandwidth too long can cause eye strain. Anyone who's ever worked with laser will know this.

    Good luck and if you wind up gelling up a conventional fixture go with the ETC source fours, they output far more UV than most other fixtures on the market and their reflectors are made to be passive for infrared and other slower heat bearing bandwidths so it'll be a little easier on your budget as far as burn thrus are concerned.



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