I installed the motion light today. I ordered the amber lens and the LED bulb, but it already had the LED. So, I used the bulb that I ordered on the other outside light; at the other door... at first the bulb pointed down, so I had to turn the socket in the fixture to get it to point out... don't try to turn the bulb itself.
It does seem kind of flimsy especially the lenses. I sealed the clear lens, which are I assume where it senses movement, a bit better and sealed up a hole top center of the main lens. Of course, I ran a bead of silicone around the housing to trailer wall, leaving the center bottom open to allow moisture or water to escape.
It has the ability to trigger a relay (optional extra), which could be used to turn on a light under your step, a cool LED one, for instance. I didn't get a chance to test it, but when you flip the wall switch, you get a regular light the first time; flip again turns on the motion light, and so on. I did pay a little less than the link shows the price to be.
Amazon.com: Starlights SL-1000 Smart Light 1000 12-volt Exterior Motion Light, Black: Automotive