I'd say that the bulb is burned in now and I'm so far very impressed. I'm running off an IC660 and it is consistantly brighter than the VHO actinics. Although this may not be the case with standard t5 ballasts. The bulb runs about as hot as the standard 10k bulbs. Light intensity seems to be good, but its hard to compare the VHO reflectors to the t5 reflectors because they are two different styles. I'm using the IC reflectors for both.