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Mars Hydro
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super has answered the first one well. I will answer the second one. The BTU of MarsII1200 is 1883. It has the same power as 600w HPS but you still save a lot heat from ballast, ventilation, A/C and etc
I have just one more question? (Yeah right) when hanging my little mars 60x5 led next to the 1200 in flower should I keep it next to it at the same hight or a little to the side farther down? Hanging it with it I worry about casting a shadow with the 60x5, and do you think the Mars ll 1200 will run my tent cooler than the 400 watt MH/HPS
I would say it depends on your plants. The advantage of having multiple lights is to keep the top of the canopy even. You can set different lights to different heights. I leave my lights at the same height and lift the pots from underneath the level the tops. What ever works for you.