im not saying less light is any better but this articale that i just got done reading in hightimes jorge cerventas grow guide i may make a thread of this later but i dunno its called yeild of dreams it says this guy james is says hid lights couse lots of heat and with that heat come lots of problems in a growers space temps should be around 75 during day and no less than 55 during night he has came up with the following he has he says this way yields two times as much with less light he uses he uses 10 hps lamps he messed with numerous different light patterns light regimes ect ect and found that the zig-zag way is best he switches 5 of the lights on 2 hours then the other set so each set of lights are on 2 hour intervals and that way he cuts his bill down by half and this is wear it gets very interesting in order for this system to work properly you need 4 lamps his first grow yielded 9.3 pounds around 70% of his last crop as he started to get the hang of this light regime yields started to climb in a diff grow op from two ladies they do the same light regime that james does there grow was perfect till it cought a virus and they were forced to harvest 110 healthy plants two weeks early only 7 weeks into flowering when dried and cureed there yeild was 4.8 pounds givven the total amount of wattage(600 watt hps) they harvested roughly 0.7 grams to the watt for every 30 days of flowering everyone knows the bechmark is 0.5 grams per watt each 30 days it goes on to say this was a major improvement there next crop yielded 3.1 kilos of dank from 150 plants 0.7 grams for each watt for 30 days of flowering(1.4grams for actuall time flowered) however the yield was low becouse they didnt grow the clones long enough these polish dudes are currently using this light regime and getting 1.6 grams per watt for every 8 weeks of flowering if you want to get full deatails of this you should go to hightimes or get the mga