(06/28/2008) - At last--a T5 actinic! This is the real deal--your greens will glow with that 03 metallic sheen fluorescence, and the tank will be washed with a VIOLET-blue tint. This bulb is not overly blue and low on fluorescence, such as with ATI or UVL's so-called "actinic" bulbs--both of which are much brighter, yes, but also much bluer and not so actinic. This G-mann actinic bulb is dimmer, granted, but the actinic effect is true 03, and that is what these bulbs are for--not for high PAR blue output. For that, you should look into Blue+ type bulbs. If you are a fan of UVL's VHO Super Actinic, this is closest you are going to find in T5's...!