I currently have red incandescent bulbs. But my LED's are ordered along with a solid state flasher. It's been on my mind because another rider told me that when they were behind me, my tail light looked like it was not on. It was on. Just not bright.
And I don't usually ride in the cold. But honestly, the batwing doesn't seem any different than the Memphis Shades windshield I had, as far as air hitting me.