Hello Mr. Welsh,

it is Normal to strecth when you go from outside to inside... OUt door buds have much closer nodal growth.. the power of the sun can't be matched by a bulb.. so the plants stretch....

Keep the 600watt bulb as close as possible (without burning your foliage).. if you can have a fan blowing between your plants and the lights and have an exhaust fan drawing the heat away from your fixture/bulb.. you should be able to get that light 6 -10 inches from your foliage... this will give you huge buds.. equivelant to a 1000 watt HPS..

LIGHT PROXIMITY is one of the corner stones to being a GREAT indoor farmer...

and NOW you KNOWM


PS - use both the 400watt and the 600watt