T5's are still the most used but if I were buying from scratch now I would go with the HO LED
's like buildmyled offers. Even though they're kinda pricey, not having to buy bulbs every year would make the long term cost even. Plus LED
's use less electricity. I'll say in 5 years flourescents will be past technology. From what I've seen Brian_Nano post, the finnex is a bit less light than a dual T5HO. So medium light. Hope this helps. OS.