The one I installed recently works pretty much like what you want. A momentary
power off/on will turn on the light, but only when it is dark. If you lock it
on during the night, it resets at dawn. Not sure what brand it is, I got it at
Home Depot. Mine is a glass fixture, not a floodlight, but I assume the method
of operation would be the same on other models. You can check the operation
manual before you buy one.


--
Dennis