I believe the optimal distance to place a LED light panel depends on the brand, whether uses 3 watt or 5 watt LED's and the angles of the lens or reflector used. I believe most 3 watt LED light panel manufacturer's recommend a 12"-18" minimum height above the canopy and most 5 watt LED light panel manufacturer's recommend a 18" minimum height above the canopy. I would use 3 gallon size pots if you are able to place all 3 plants in your grow area. I had not expected my plants to grow as large as they have under the 1x Lush Lighting Dominator 2x and would have used 5-7 gallon size pots with all 3x of the AK48 #3's and the 1x Hindu Kush #3 with the height that they presently are. I can only comment on the Lush Lighting Dominator 2x and the Lush Lighting Lumenator 2x and the growth and flowering response I have seen with using the full spectrum lighting.
Here are different illumination sources and their efficiency
Incandescent: 1.9-2.6% (10-17lumens/watt)
Halogen: ~3.5% (35-60 lumens/watt)
Compact Florescent Light and Tube Fluorescent: 9-11% (Compact Florescent Light 50-70 lumens/watt Tube 30-100 lumens/watt)
High Pressure Sodium: 27-32% (100-150 lumens/watt)
Metal Halide: 25-30% (75-100 lumens/watt)
LED: 17-46% (1mw -167+ lumens/watt)
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