I found what I had hoped would be an awesome solution to my outdoor wood shed lighting. I currently use a fluorescent 2x48" fixture plugged into a SR227 and a MS16A to turn on lights in the dark when motion is detected. This has worked acceptably for many years. The reason to replace it is not saving money as the lights don't turn on often, but rather to remove the X10 motion sensor and turn the unit into an integrated fixture.
Costco has a Feit 48" fixture with integral motion sensor that throws a ton of light (4000lumen). I tested and found that it eats a lot of signal. In my testing, the fixture reduced a signal of 8.7mV down to 5.2mV when measured next to the fixture. I do not know how this would affect signals when further away from the fixture, but I'm not interested in adding anything that will degrade things. The fixture is sealed, so I can't see if there's an easy way to add an integral filter.
The other issue seems to be that the motion sensor turns on the light even when it's light so it doesn't have a light level sensor. I have lots of animal activity, so I don't want to constantly light the shed when a rabbit moves by. Between these two issues, I can't recommend this fixture.