OOO ya and I agree with shortening your light cycle even if just temporarily due to the fact that it photosynthetic and derives its energy from the light. Also how old are your bulbs? Older bulbs put out a different spectrum over time. This spectrum shift comes from the walls of the light bulb being porous. (even though it looks solid) These pores allow the molecules that are in the tubes to escape. This happens slowly over time normally if left at room temp. Think about how every so often you have to test your air pressure in your tires because air slowly leaks out, its the same concept. Now these escaping molecules get "excited" and move really really fast when the light is turned on. this increase in speed increases the amount of times it bounces off the walls of your light. Each time it bounces it has the chance of going through, more bounces = more chances to leave = more leaving gas = wrong spectrum