Quote Originally Posted by rbush
and cangroit, 90cm sould be fine? isnt it too far?
they don't call them High Intensity Discharge lamps for fun.... 90cm would be too far for a full blown plant in flower but a seedling needs to reach for the light and grow some leaves to catch it before it can take the intensity. Start at 90cm. If they look like they are stretching, lower it to 80cm. As it grows, close the gap between the lamp and the plant tops, but wait until you have at least 4-5 internodes before getting it as close as 40-50cm. Once in flower, you can get it as close as 30-40cm, as long as temp permits....

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CanGroIt Reviewed by CanGroIt on . new grower with a question hello all! i have 2 seedling thats few days old, they alrdy sprouted from the soil i have only 400w hps light with cooltube and air controll my grow room dimensions are hight:150cm length:75cm deep:55cm i want to put them inside the closet now, so my question is how far should i put the 400w hps light above my sprouted seedlings?? Rating: 5