your plants will do well if you:
1.) have good nutrient in the soil for root feeders,
2.)have nutrient in the water for plants that use leaf absorbtion, and
3.) have the right spectrum of light for growing plants (in the right wattage).
now you have to find out the Kelvin rating of your light. it should be on the tube, its the number and then a K symbol.
eg. mine are 18000K, others can be 6500K, 10000K etc etc. :bounce:
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those underwater lights are awesome, im currently trying to see if I can find anyone to drill a hole in a nice vodka bottle - at the base, so i can make it a lamp! lol