Try and find a light made for plants, doesn't matter which type.
LED, T5-NO, T5-
HO, T8, T12, Halogen, Compact Fluorescent, Power Compact.
Look for a light with Kelvin spectrum in the 3500K - 10,000K range. The lower the
K rating, the more yellow the light is, the higher the
K rating, the more pure white the light it.
Fluval Plant 3.0 is a very nice light, you van likely get away with FLuval Aquaksy for Java Ferns alone.
Sunblaster or Odyssea T5-
HO's (1 or 2 bulbs).
Nicrew
LED
Beamswork DA FSCPEC
A couple 26 watt cool with CFL bulbs in lamp housings are all goo options.
Linear Mode
