Continued navigation light work...always get much less done than hoped for! Laid out pattern on mirrored plexi, experimented some with scrap plexi. Started cutting 1/8" x 1" Al for 8 electrically isolated heat sinks. Compared bright white Luxeon LEDs against 35 watt HID landing light for visibility as recognition light...HID far superior so I won't install white LEDs in wing tips.