Travis
10 and over club
A SE bulb and a DE bulb with the same Kelvin rating from the same manufacturer can be completely different animals. I checked Sanjay's site for CCT info on the Reeflux bulbs but it doesn't look like he has tested the DE bulbs yet. But just to give an example, a SE 250w XM 10k on an Icecap electronic ballast yields a CCT of 11543 and appears crisp white. While a DE 250w XM 10k on the same ballast only yields a CCT of 7541 and apears very yellow.