It doesn't need a bulb. And it loves high light. I have over 3 wpg, and my
Nymphaea are doing fine.
Are you sure your plant is getting enough nutrients? Nymphaea like root
fertilization. (I use Seachem root tabs, as well as Jobe's spikes for
phosphate and nitrate.)
Leigh
http://www.fortunecity.com/lavender/halloween/881/