now that you've posted your introduction post, you're able to post elsewhere on the site. i would advise posing your question in the general bike forum here. i would also advise against putting a higher wattage bulb on your bike. it will draw more from your battery, and as already said, will produce more heat. if you are replacing the factory halogen bulb, there are tons of same wattage halogen replacements on the market to choose from. i'd imagine you would want both passing lamps to look the same and not have one brighter than the other. so if you're replacing both, there are brighter halogen options to go for such as from PIAA, Sylvania, etc., or you could switch to LED which will be both brighter and less battery draw/heat than your current bulbs.