I'm building a light signalling system for a gliding/soaring club that will be used for indication to the winch driver. This is done by means of flashing lights where the on/off timing indicates the launch phase (take-up-slack, all-out or stop). The original plan was to use car spotlights (2 x 55W) but I am considering LEDs. Assuming LEDs would be suitable for this application (I have no experience of using high intensity LEDs) can anyone enlighten me (pun intended!) on what would be the best type to use i.e. colour, brightness, quantity etc. The light will be located at the launch point (i.e. where the glider starts from) and needs to be easily seen by the winch driver who is over 1000 yards away. It needs to be usable in bright ambient light conditions e.g. on a summer's day (yes we do occasionally get them in the UK!). Thanks