General electrical wholesalers have strobes for about R80 that work very nicely....... at that price you can have on each
Ask them for their catalogue and look for the following product:
Make: Seven Stars strobe beacon
BPM: about 110 per min on 12 volts
Output: 3 watts
Shape: Round beacon
Size: about 80mm diameter x 35mm height
All colours available: red green white amber
Runs perfectly of a 12volt. ive tried it at night off a car battery and its easily visible from 2 miles. Catalogue states it waterproof and vibration proof.
They have a round plastice base with two threaded bolts through for mounting..... easily mountable onto a trike in various positions..... eg: wing tips, the kingpost, the rear of the motor, below the passenger, the wheel spats. top of your flying helmet

etc etc etc
I sourced mine from East Rand Electrical in Benoni CBD.... sorry cant remember the exact address or ph number but im sure 1023 will be able to help.......
ZU-CPW..... t/bird mk2
Hoedspruit Civil Airfield
Hangar 8