temperature mess

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dmitriandsnow

Well-known member
Was wondering, should the 93cri 5900k 2500 lumens fluorescent bulb tint green?  Considering the specs i expected a color temperature tint of blue. I tried compensating by opening the aperture to overrun the tint. Also tried the scene file settings (green purle) did not turn out to be effective at all. Was wondering if this is a normal case with a daylight balanced bulb? Could this be the ballast/lumen output also?
By the way these are the bulbs ordered from Full Spectrum Sollutions. These are the 12t 48" 93cri 5900k 2500lumen full spectrum bulbs.  I will be shooting a white room lit with 8 fluorescent bulbs. Shooting anamorphic so no minus green filters acceptable, bummer!
Last thing, if this is in fact a normal case how do you compensate?
Thanks for input!
 
Re: temperature mess

The green has nothing to do with whether the bulb is daylight or not. The green isn't part of the color temperature, it has to do with whether the bulb is truly "full spectrum" or not. I have a few Full Spectrum Solutions bulbs, and they all show green.

You can attempt to control the green in a few different ways. First, try shooting with the FLUO matrix -- that's what it's there for. FLUO boosts all colors except green & blue, figuring that the green spike in your lamps will compensate for that.

Second, you can gel the lights themselves with MinusGreen (which is a purple filter). Try a few different strengths, 1/2 or full. In my limited testing I found full to be too purple for video, even though full MinusGreen worked perfectly for balancing the lights for film use.

Third, you can try the CHROMA PHASE setting. Try setting it up to about +7 and see if you're getting better color rendition. +7 tints the video towards magenta, which may compensate for the green spike.

Finally, you can always do a simple manual white balance, and that should go a long, long way towards overcoming any green spike! :)
 
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