I am surprised this thread is still active. But the answers are very informative - Thank You!
It seems the lower wattage (within reason), and more white/yellow spectrum seem to work best (with notable exceptions).
I have read in other threads that the basic fluorescent household bulbs (usually <6500 Kelvin) have had great success.
I picked up a used 10w 5500K aquarium light cheap from another hobbyist. We will see how it goes when I get my tank set up.
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