Gossen Colormaster reading of LED fixtures

[Alexandre de Tolan]

Today handed me over 2 LED fixtures from a Chinese manufacturer to give them a try. When I first put them at work I instantly noticed a visible green shift in them. Picked up my Colormaster 3F and it measured the Led fixtures at 9750K!!!

 

The meter asked for a +75 Mired shift to color correct it to 5500K and a CC25 Magenta. That's almost a full Minus Green.

 

I've done a quick photo of my wife and her skin tone was way off.

 

Tomorrow I'm going to try it with a half CTS and full minus green and compare results. Lee declares 70% transmission for half CTS and 60% transmission on Minus Green. That's about 1.3 Stops loss on filters alone for a fixture that measured 800 lux at 3 meters on my Sekonic 758 Cine.

 

The guy who bought them gave 600 USD for 2 units which I find expensive for what they are. But he seems happy with the acquisition.

Edited January 14, 2016 by Alexandre de Tolan

[niulinfeng]

which Chinese manufacturer? tell us so that we can avoid it in the future .

[Adrian Sierkowski]

this really shouldn't come as too much of a surprise. LED can be MANY things, the good ones aren't even really all that good, and the cheap ones, well, they are what they are in many ways. There is a reason why, for the most part, they aren't super highly used-- though LED and other such technologies (remote phosphor and plasma) are getting some acceptance, but even still, they aren't exactly a choice to make where getting skin-tones right is, well, as important as having a batter-powered, small, light, and cool running fixture is.

 

Also I bet if you bought another batch of lights from the same company they'd differ in quality from the ones you already have.