You may be making, have made, a mistake.

Many LEDs can be made BRIGHTER by supplying 150% of maximum rated current (power dissapation, really) but with a low pulse width duty cycle resulting in an average current supply of 100%.

Even moreso the 150% current flow might only have a 20% dutycycle thereby maintaining good BRIGHTNESS but lower power consumption, less HEAT to dissapate and thus longer lived LEDs.

The light from a lightning strike is VERY brief but very NOTICEABLE.

My LED DRLs flash at 4Hz when the horn is operating to "alert", get the attention of, oncoming drivers beyond hearing range.

 

interesting read. so one of these:

http://www.v-leds.com/Exterior-LED/D...01806-1-3.html

with the proper rectifier will work?