space constrain...no more space in my hood...
i did a little calculation myself...
2 X 39W t-5:
ballast $40
tubes $44
reflectors $38
end caps $40
total $160
1 X 250W
ballast FREE
bulb $50 from u
reflector $75
total $125
tat's y i went for 1 X 250W + 2 X 39W...
i cannot go for all t5 also, becos i need space for my 2 X profantic fans...