They're the halogens. If we mount them upside down, Hella recommended rotating the retaining rings 180 degrees so water will properly drain from the housing.
These lights are heavy (probably 5-6 pounds each) which gave us concerns about how securely the inverted mount would be. Instead, we fabricated some brackets to mount the lights on the bumper without them interfering with access to the winch. The only negative of this solution is that the lights are not well protected, but they should be up high enough to avoid much mishap.