FIrst Grow + Photos , something is wrong with leaves

[toastybiz]

Originally Posted by up4anything

the distance you should keep your light is determined as follows:

Put your hand under the light at the level of your plants' canopy. Raise the light (or lower) until it is where you can keep your hand under it for 60 seconds without any discomfort. Whatever distance this is, is the MINIMUM distance from your light to the top of your plants.

Originally Posted by SmknVTEC

On a 250 watt HPS I would go 25-40 cm away from tops.

Agree with both of these, I believe the technique from Up4Anything will result in the distance SmknVTEC recommends. Yo, for the Americans, that 25-40cm is about 10-16 inches. The other recco of 60-90cm (24-36 inches) sounds too far away but whatever distance results from the back-of-the-hand test.