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..to be honest with you..I hardly use them...especially since I swapped out the stock high-low bulb for the HST-4 high output bulb you can buy at any auto parts store...it is really good and lights up the night awesome when you throw it on high beam. Some people will say they always use all 3 lights during the day to get the attention of idiots in cages...but I don't see that on the road that much...most FLH'S I see only have the middle light on