An H4 is a dual filament bulb with one filament for low beam and one for high. The original equipment H4 bulbs on most cars and motorcycles are 55 watts low, 60 watts high. The rating is stamped on the base of the bulb.
Higher power H4 bulbs are available at many auto parts stores and motorcycle shops in North America, I would imagine that is the case in Europe too. While Phillips is an excellent brand, I have used plenty of brand X high power bulbs, often made in Hungary or India, with excellent success.
The most common high power H4 is the 80/100 watt and I have used these in many cars and motorcycles with excellent success. On a KLE500, or other mid-sized single cylinder dual sports, I would probably recommend a 55/100 watt, which will be the same as stock on low beam, but give a stronger high beam. With a 55/100 you will not tax your charging system in stop and go riding, but you will have the strong high beam when you are out on the open road. I used a 55/100 H4 on my dual-sported Honda XR650R from the U.S. to Yaviza Panama and back with no problems.
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