For my 2.5 G tanks I use 13W bulbs. Each tank gets half of an
AHSUPPLY 26 watt bright kit. I just build a new hood from rain gutter
parts, I like it so far.

Seven watter per gallon ought to work :-)

I tried rain gutter too, white plastic stuff. The problem I had is the
heat from the lights (not insignificant) makes it hard, brittle
and over time turns the inside brown. I ened up grabbing a bunhc of
cheap incandescent hood from garage sales, they have a metal plate
to diddipate the heat. You can scavange a bit of the otherwise waster light
if you add some reflector material.

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