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Depends on the kind of bulbs you get. 4x54 watt Giesemann Midday bulbs with individual reflector for each bulb wil be very high light for a 75. 6 of these and you could fry eggs over your substrate.

Any other T5HO bulb will be less effective. But if you decide to use T5HO you will see that Halides have only 2 good things:

1. Can be placed high above the tank without considerable light spill
2. Make cool shimmer underwater

--Nikolay
 
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