HID 400W Distance Advice

[jmrathbun]

It will soon be time for me to move my collection indoors for the winter. I have a 400 W Warm Deluxe HID bulb that I can adjust from three to five feet above the plant table. I usually put my Blc varieties directly under it, with Phals, Paphs and such off to the side. The room stays cool, so I'd like to heat the plants as much as possible from the light without burning the leaves. The tallest plants are 22" from table to leaf tips. Do you think I dare lower the light to 36"? (for clarity, that would be 14" above the leaf tips) When new, hung four feet above the table, this light was putting out 5000 foot-candles at leaf level. (that was 26" above the leaf tips)