Why would you need any kind of light in the daytime?
Drivers in Florida are mostly tourists who care more about the scenery than what’s going on on the road, Q-tips who can barely see above the dashboard or local folks who are angry and late because of the above (common bumper sticker: “When I retire, I’m going to go up North and drive slow”).
Anything I can do to make myself more visible is an asset. I think it also sends a subtle message that I belong on this road. Kind of like the way a dog marks his territory.
Besides, I figure my estate’s lawyer can use it to help nail the driver who runs over me.