I had a similar situation for my FCG so bought a cheap shop light and two 48" tube style bulbs from HD, the kind that has no cover and leaves the bulbs exposed. I painted the back side and ends of the fixture flat black and put silver reflective tape on the reflector side. I just laid the fixture on the ground bulb side to the prop. It was totally invisable from the front in the darkness. Cost was about $25
These blue LED spots from Spirit are great for making things glow. They give off a little blue light but anything that would glow under a blacklight glows too. It's kinda like a actinic light for aquariums that make the corals grow. I use them in my yard to make my pumkin creeps glow and some ghosts.