I always assumed that incandescent lights would not effect plants photo period as much as florescent lights would. Florescent lights would be more efficient for growing then incandescent would. Granted we can see the light but some rays we can not see. Such as ultra violet rays. Who knows if this effects plants in such a way in nature. Florescent light emit uv rays. I think its every 8 hours is 1 minute of supposed sun. But grow lamps also usually emit a blue and/or red spectrum. Check to see what kind of light you have on the front door. Florescent lights may save you money, but yes bloom, no blooms, maybe blooms...haha who knows....hmmmm what to do, what to do??