How about something like this on top of the fuselage and another on the bottom? If mounted from the inside through a hole it would be less than 20mm tall and I'm guessing a streamlined bubble to cover it wouldn't add any significant drag.

https://www.superbrightleds.com/more...Specifications

This appears to be the same as used on emergency vehicles and with a draw of over an amp at 12v, it sure seems like it should be bright. I'm sure a much slower flash rate would reduce the current draw.

I've seen a bicycle headlight strobe while looking into the rising sun from more than 4 miles. I was sure it was a police car flashing headlight with someone in front of him covering one of the lights. But when I got closer it was a bike!

5Z

On Wednesday, January 27, 2016 at 12:11:48 PM UTC-8, son_of_flubber wrote:
LED lights for the shade and mirror for sunlight would be complementary.

A forward facing LED strobe is a big payback even though it works on only one axis.