lower light until you feel a slight heat on the top of you hand when located right at the top of your plants. 16-18" is good usually, but If you have good fan blowing across top of plants and under the lamp, you can get it closer....the key is...you want your nodes to be closer together, anmd the closer then light the tighter nodal spacing will be and in the future...tighter buds.

A rule of thumb is: lower lamp until you cannot stand the heat from lamp after 30 seconds...then raise it 3" and check again...Hand at top of canopy...too hot! raise light.................Not hot! lower light. Now take note of distance from plant canopy and keep it there; raising it as necessary to keep lamp at safe distance...
remember...for every foot you have your lamp above cnaopy...You are losing 1/2 the light's potential intensity on the plants. peace
latewood Reviewed by latewood on . Our First Grow . Any Advice ?? As you all know this is our first grow and we feel is going great and we would like to post pic's from the beginning to now to get your all thoughts and any advice . The plants are now about three weeks old and got the first feeding tuesday and we changed the light from m/h to h.p.s. to speed things up. ENJOY PIC'S////...When do you all think we need to change to veg to flower??? 1st pic is from 11/12 2nd pic is from 11/15 3rd pic is from 11/18 4th & 5th pic is from 11/24 Rating: 5