mounted orchids under halides

[frogman182]

so i get to have fun with the boss's money. in the pet store i work at we are making a display tank that is full of submerged plants for aquariums and then some driftwood sticking out of the tank to look like a swamp. the tank has 500 watts of metal halide light above it and we would like to mount some cool orchids on the driftwood. the plants would be anywhere from a foot to two feet away from the lights. any suggestions from anyone would be awesome.