I saw that too. Looks like a small chamber in the middle but the reflector is probably a parabolic. Wait, i take it back. Should be elliptical because a runway light will be set to spread a narrow cone around the AOA of the incoming planes. ~13 with +/- ~8 degrees. It will probably be incandescent because they are slowly strobed up the runway. Cant do that with MH!
With a color temperature of 3000, I would not recommend it. Although it doesn't say the lumen output, comparable bulbs produce between 6000 and 8000 lumens, which is not nearly enough for a projection system.