And remember, "flashing" lights other than your signals are illegal! If you ever encounter an uninformed LEO who pulls you over for them, they are going to accuse you of having "flashing" lights. That is your opportunity to educate them that your lights are modulating, not flashing.
Always be sure and carry copies of the FMVSS that shows they are legal in all 50 states. It has kept me out of trouble on the several occasions I've been hassled.
I had a Kisan modulator on my dual-headlight GL1800 and it worked just fine.
'01 Honda GL1800 - SOLD!
Now proud owner of an '03 BMW 1150 GSA!
SS1K (1K miles in under 24 hours)
BBG1500 (1500 miles in under 24 hours)
100CCC Insanity (San Diego - Jacksonville & back in under 100 hours)
SS1K w/ my 9 y.o. daughter
Border-Border-Border - Insanity (Canada - Mexico - Canada in under 48 hours)
48++ (48 states, + Mexico + Alaska in under 10 days)
10-10ths (pending cert) (10K miles in under 10 days)