Hey guys. I converted the light to H4 on my Yamaha YBR 125. So I’m not the first to have the alternator no problems with it. It delivers 115 watts at 14.0 volts at 5,000 rpm (according to workshop manual). Of this 60 watts (previously 35 watts) go to the H4 light and about 15 watts to rear, standlight and speedometer lighting, i.e. about 75 watts. Should therefore not be a problem. Nevertheless, the light seems to suck out the battery. If I use the E-starter (and a round of time) I notice the longer and more often I drive, turn it off and press the E-starter, the less “will it”. Here in short form what has already been tested: -LiMa was measured, resistance & output voltage (30-180 volts) fit -Controller could not be measured (is located directly under the tank); but should fit, because the battery with the old 35 watts of light is constant 14,0-14.2 volts -lead acid battery was replaced for a new lead-gel battery -Power verb smoke of the new light has been measured, with 4.91 A (+-3%) is relatively accurate at 60 watts – on the battery with switched on H4 light are only 12,9-13,2V depending on the speed – creep currents I exclude, because it does not cause the problems overnight, but only after it was driven I am with my Latin at the end. Next the tail light is replaced with an LED tail light, it saves only 5 watts while driving, but 21 watts when braking are already something. MfG Iumak