Ok so say you have an Arri 1K you'd like to bring down to say around a 600w or a 650 you'd like to bring down to something around a 300w....
Using a Variac: http://www.officebeyond.com/va-130-1000.html
How dramatic of a color temp change is there going to be when dimming the light sorce down to about half strength? Will this introduce horrible shifts to a warmer color temp?
I've always just used a 300 for a 300 and a 1k for 1k never really used a variac to change power going to the fresnel so I have no idea what to expect... anyone know?
Its just an industrial strength dimmer, no magic being done. So any know, or better yet have footage of this being done?
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G.P.Guest06-23-2011 04:59 AM
06-23-2011 05:16 AM
Generally 1/4 CTB will correct for a light a half brightness.Paul
Camera and Grip Electric Rentals in Dallas and Shreveport
Phoenix Video Productions
06-23-2011 05:21 AM
- Join Date
- May 2010
This chart shows the relative shift of color temp vs voltage as a ratio multiplier for a tungsten halogen lamp.
Below 80% voltage color temp drops very rapidly with very little blue green spectrum.
My experience using a combination of dimming and CTB color correction is you wind up with a red/blue color cast with very little yellow/green. ND gels or wire scrims are better for reducing light output.
G.P.Guest06-23-2011 10:41 AM
Thanks guys that chart was perfect. Scrims and nets it is!
06-23-2011 12:49 PM
You also might be able to re-globe it with a smaller bulb, but I usually use scrims.
06-24-2011 08:23 AM
- Join Date
- Jun 2005
Here's the link: http://www.newport.com/Quartz-Tungst...3/catalog.aspx