I find the lights working great although one of the tube flickers a bit..generally OK..
The important thing i manage to discover that a myth among aquascapers seems true... 6500K lights are indeed better for Pearling and maybe photosynthesis for aquatic plants.
Above is the effect of 4x T5HO ( 3x12000k and 1x6500k) for one hour
Can you see the difference of the numbers of o2 pearls? imagine if i have 4x 6500k tube.. the result may be better? hehe that is for my next experiment... Seaview here i come.... lol