Well, once again! Thanks! I found this on High Times.com
"Forty percent less heat means that the lights can be 40 percent closer to your plants without burning them. This alone cuts the difference in efficiency between the 1,000-watt and 600-watt lamps nearly in half. The placement of lights—especially always maintaining the perfect height in relation to your plants—is essential to extracting maximum yield. The highest yields and densest buds come when lights are kept close as possible. During times of peak growth, you should adjust the lamp height every day. Set-it-and-forget-it growers should stick with 1,000-watters.
Twelve inches or closer to the plant tops is recommended with 600-watt bulbs, though the distance will vary somewhat depending on your ability to cool the lamps and the surrounding area. After colas form, back off an additional 4 to 6 inches to prevent scorching. Once plants and root systems are established, blast the plants with light. Intense light is the key to developing close internodal spacing during vegging and early flowering. "
So, I dropped the light to about 14"....