I am trying to control an el-cheapo 2 bulb 4' florescent Shop Light with
an MS16A Motion Sensor and an RR501 Transceiver.

The shop light has a 3 prong plug, but the Transceiver only has a 2
prong receptacle, so I used a 3 prong adapter to plug the shop light
into the Transceiver.

What I'm finding is that (99% of the time) when the sensor sends the
signal to turn off the Shop Light, it turns off and then immediately
comes back on. The Transceiver goes click-off-click-on.

I'm pretty confident that it's the Shop Light that's causing the problem
since I've tried it with 2 different Motion Sensors, 2 different
Transceivers and 2 different circuits. I even used 2 different
Transceivers on 2 different circuits, one with the Shop Light and the
other with a regular incandescent table lamp. The incandescent turns off
and stays off, the Shop Light comes right back on. I then swapped the
incandescent and the Shop Light between the Transceivers and the problem
followed the Shop Light. I've tested every possible configuration
multiple times and the problem only occurs with the Shop Light.

Do you think it's the Shop Light itself that's confusing the Transceiver
or the fact that it's not grounded?

Thanks!