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The only T2 lights I know of are spiral CFL light bulbs. They give about the same intensity as any other CFL bulbs.
I think the linear T2 bulbs are still being used for aquarium lighting... probably not a whole lot of people using them now-a-days. I've used both T2 and T3 spiral CFL's (same wattage and color temperature) and agree with Hoppy's statement about light intensities being the same.

Although 2-3 years old, there is a thread on another website that may be of interest http://www.myaquariumclub.com/experience-with-t2-lighting-13690216.html
 
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