Quote:
Originally Posted by TLH
This will be lighting for my new future freshwater planted tank. I am looking at 48" long with 4xT5 bulbs at 54w each. This will be over a 21" tall tank with a footprint of 48"x15".
Firstly is that too much light or not? 216w is quite a bit of light.
Should I run 2 bulbs for the full photoperiod and cut the other 2 in for just the midday burst only. BTW I have pressurised CO₂.
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That's a lot of light for that tank, but whether or not its too much really depends upon your abilities/skills......

If you have any questions about your ability to handle a high light tank, then my suggestion would be to start with 2 bulbs and work your way
up! 
Heck of a lot easier then jumping in neck deep and you'll learn more in the process that way.....
HTH