keep the light a foot away until it pops out of the soil. Then keep it at 3-4 inches, if it starts stretching then lower the light 1-2 inches from the plant.
Also, socom meant put your hand at the plants level and if it's too hot for your hand, then back the light up, if it's not hot it's ok.
Also make sure the top of the soil doesn't dry out, if it's not damp spray it with some water making it damp.