Was at Walgreens the other day and was digging through their odds and ends sale bin. Found a set of LED's for $3.00. What the heck. They're portable with no wiring or drain on lipo and can be velcro'd. Uses replacement calculator batteries. Come in Red, Green and Blue( More like white) . Can be switched from steady on to slow flashing strobe to fast flashing strobe.
Will see what they look like on the DHC Beaver or GP Escapade.
(edited to add Youtube window) -NB