I switched to the Sylvania Silverstar bulb (9003 ST), and have been told I'm very visible during the day, even with it on low beam. I use the high beam at night and it becomes day time -- I can see the four-legged critters well in advance.
I always run brights, except if I'm sitting at a traffic light at night, and notice I'm blinding the people in the cage in front of me, then I'll usually dim until the green light.
get road lamps- they add extra light at night and also make cagers much more aware you are there and it is a bike not a car with one headlight out.
I used to run with Highs all the time, but after i got the auxiliary lamps, mainly using the lows. Those auxiliaries combined with the regular (Silverstar) beam makes you quite visible.