Never installed on bike. Found out after purchase it will not work with low beam LED headlights and halogen high beam. (long story). $50 plus shipping from Middleburg Florida.
COULD'VE JUST SAID PULSATING HEADLIGHTS !A headlight modulator is a federally approved option for motorcycles that rapidly cycles the headlight output from full strength to 20% intensity. See here for more details:
Lighting Control Modules - Headlight Module - Signal Dynamics
While there is little experimental data or studies, there are anecdotal stories and opinions that they increase conspicuity which may help reduce crashes or near misses. Others report they increase annoyance and road rage. The opportunity is here for someone to try one at a reduced price and develop your opinion based on actual experience.