ECN Forum Forums General Topics of the Trade General Discussion Area variation in color of fluorescent tubes

I just went through this with some lights in a schools biology lab. The answer of cheap lamps is the most probable cause. I used the Granger catalog to help explain the problem. The catalog shows the Color Rendering Index (CRI) and it shows the lamps are rated from 0-100 with 100 being the sun or incandescent lamps. The lamps in the 41k range vari from 62 to 86. Still lamps from the same box should all look the same so its back to the cheap lamps as the cause for your problem.

Dave T.