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Most hps bulbs are duel spectrum :)

I'm running a 200 watt cfl for 6 hours and a 400 HPS system for 18,the plants are 5 weeks old from seed and are looking mighty fine.. i only run the cfl to give the ballast a break from constant running,cuts the bill (a bit) and give the plants a little break from the hid.. although,with my cool...

according to the jorge cervantes grow bible i have in front of me,plants grow best under 24 hours of light,contrary to belief...