Quote Originally Posted by mikeandjenherbals
if your light is at 10 inches above plants they will not stretch much if at all, i usually have 1000 wt hortilux 5ft10 to 6 ft off the ground, on veg cycle you can really see the difference it makes, lite closer ,the structure of the plant will be compact, then raise your lite a foot and watch where the next node comes in, ive posted a few pics in adv. tech. forum, dont burn them till its in a paper
At 6 feet away you are giving up all your lumens dude. FYI

Lumens is a mathematical formula that measures the bulbs intensity at 1 foot. The color or type of bulb is not calculated in the formula I=L/D²
Lumens received are a measured in watts-per-square foot or foot-candles. Calculating foot-candles or lux is a more accurate way to estimate the amount of light plants receive. This still only measures how much light you plants have available but not how much your plants use.
Light diminishes exponentially fast!
The closer your plants are to the light the more lumens they receive the better they will grow, as long as the heat from the light does not burn the foliage.