[niko]

Mosses grow perfectly fine in ambient light (no light over the tank).

You have to see the fish room that a local guy has. About 10 very lush planted tanks. About 1 wpg at most. I will visit him this weekend and I intent do take pictures because what he does it truly something to see. Basically he can grow about 20 species of plants under 1 wpg, no CO2 and with HOB filters.

If you really have to have good light consider Giesemann Midday T5HO. A single 39 watt bulb with an individual reflector will work wonders for your tank. If you put 2 of them then you will have enough light to grow anything your hearth desires.

--Nikolay

 

[niko]

Frank,

If you put two 39 watt bulbs on separate switches then you will have complete freedom. You can grow high light or low light plants. You wil end up having both bulbs on for a few hours in the middle of the day and the rest will be one single bulb. The results will amaze you.

Wiring the 2 bulbs separately requires 2 separate ballasts (one for each bulb). The best service and prices you will find at reefgeek.com. Look for the Workhorse 3 ballast to power a single bulb:
http://www.reefgeek.com/lighting/Pa...ompact_Fluorescent/Workhorse_Long_3_by_Fulham

Also you must purchase the individual reflectors. They make a world of difference:
http://www.reefgeek.com/lighting/T5...t_Reflector_for_1-39W_Bulb_by_Sunlight_Supply

Finally to make the project easy you could get 2 pairs of waterpfoof end caps. But make sure you have enough spase to fit these end caps under your existing hood. The end cap is rather fat and may not fit in your hood:
http://www.reefgeek.com/lighting/Pa...ture_Proof_End-Caps_(Pair)_by_Vossloh_Schwabe

You could also get the cheap non-waterpfoof end caps and cover them with silicone. They basically look like small version of a normal fluorescent bulb end cap:
http://www.reefgeek.com/lighting/Pa...cent_Twist-Lock_Sockets_(Pair)_by_AAG_Stucchi

You will also need 2 timers - one for each ballast/bulb.

--Nikolay