Just wondering, I know it would stifle a small amount of growth but to save money, They say your plants only need 6-10 hours of actual sunlight, So what if I kept my (2) 600 watt hps lights on for 10 hours, then shut them down and just left 2 48" flourescents on for the other 8 hours?? they would still get light for 18 hours a day but the electric bill would only be 1/2 what it would be? Just wondering!