The trick for lights under 1000 watts is to keep them close throughout the entire cycle. Keeping the light at around 12 inches above the plants will help your yield. You should hang a thermometer directly under the light, at the height of the tallest plant tip. Raising it as the plants grow. Keeping the temperature at plant tips between 80-82 degrees will encourage optimal growth. Use an oscillating fan blowing across the plant tips to cool the area.
Nightime temperatures that dip to 10-15 degrees below daytime temperatures will encourage higher potency.
Pictured is an old 400watt Halide on a 6 ft. light mover, hanging above young plants ready for transplant into their final home…:-)
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