I have a 400 watt MH on my seedlings about a foot from them, is that to close? I originaly had my light 3 feet away but i think that that was to far because one of my bigger seedlings to turn yellow. Can anyone give me any advice please.
Ive never worked with MH before but I would imagine thats pretty close. As long as its not too hot I would think its fine though. Im no expert though
Soooo, why answer a question about something you have never used?? On seedlings that is a little close... You do not say if you're running a cool hood/tube or not... Or if you have a fan blowing across them.. But general rule of thumb.. 16-18" seedlings.. After a week, 12-14"... I always suggest the hand test... Put your hand just above the plants and wait 45-60 sec., if the lamp feels like a warm sunny day on the back of your hand, your good, if it feels kind of hot, too close...
Thanks man. I don't have a cooled hood but i do have two fans and a humidifer. The temperature is about 75-79 n the humidity is between 40-50. Also my plants are 11 days in my roots r almost to the res.
