good one kl, but you may want to specify...

different plants flourish at different spectrums, and plants do better with cool specs when vegging, warm for flower.

for cannabis, 6500k is the ideal spectrum for veggatative growth. it doesn't mean the plants wont grow under other specs, it just means they will do best at 6500k. in flower, cannabis does well with warm specs, 2300-2800k is ideal for maximum bud production.

hope that helps to clarify...