Hello,
I am using this LED H4 headlight currently in my GS500F 2005:
http://stores.advmonster.com/h4-led-headlight/
More information about the LED bulb can be found here at this forum:
http://www.advrider.com/forums/showthread.php?t=976505
*NOTE: I know there is a coupon for 10% off or something like that for ADV. I'll try to find it for you guys
I haven't ridden too much at night to really conclude how well it is at night, but everyone has told me it is a lot brighter than before.
I'll see if I can take some pictures at night sometimes week to show the output of this LED headlight.
I have a bike on which the stock headlights absolutely suck (Yamaha FZR) and given that the above bulbs weren't too expensive, I decided to give it a go.
The stock FZR headlamps have multiple issues ...
They use dual-filament bulbs that are physically the same shape as H4 (usually 60 watt high beam and 55 watt low) but are only 35 watts high and low. At least there are two of them. But while you could easily swap those bulbs for regular (higher powered) H4, the charging system is not up to the task.
And to make matters worse ... the wiring is not good. The headlamps, signals, and instrument lighting are on separate fused circuits on the +12 side but it all goes back into the chassis through ONE common ground wire which is not up to the task. Result ... when a turn signal is mid-flash, all the other lights go dimmer in opposite phase to the turn signal because of the voltage drop in the ground circuit. It also means that none of the bulbs are really operating at full voltage. Changing to H4 bulbs (with higher current draw) would make this situation worse. Yes, you could re-wire and run another parallel ground, the thought has crossed my mind. The stock headlamps are very "yellow" because the already-underpowered bulbs are not being driven to full voltage. The only good thing is that the bulbs last forever because of this.
And to make matters WORSE ... the stock beam pattern is not great. Low beam is tolerable but high beam has too much light scatter in close to the bike, and also, the aiming stinks, there's too much difference between low and high. Aim low beam correctly and then high beam illuminates the treetops, aim high beam correctly and low beam doesn't go far enough down the road.
Bottom line is that with the stock lighting, you might as well hold up a couple of candles up front, they'll do about as well ...
Anyhow, I ordered two of the Advmonster H4-replacement LED bulbs, installed them yesterday, and today was the first ride with them.
The only fitment issue with the FZR headlamp housing is that the cosmetic cover on the back of the housing no longer fits. No big deal, it isn't needed.
Installation was pretty easy. The plug to the LED is a bit fragile and I broke a corner of the plastic off while plugging them in, it doesn't affect function in any way so I'm not concerned. Not having a big ballast to find a place for (as one would with HID) is a big plus, the FZR doesn't give much room to work with.
How do they work ... Better than expected. There is plenty of light output. The low beam cutoff line is not as sharp as it ought to be ... but it wasn't as sharp as it ought to be with the stock bulbs, either. I'd say it's no worse. The high beam pattern doesn't have the issue of putting out too much light too close to the bike any more, but beyond that I can't really say, because it still has the issue of low beam being too low and high beam being too high - this is probably inherent in the design of the reflector - and in my test ride, high beam was definitely aimed too high. Low beam worked well. I've since re-aimed the headlights lower (by quite a bit), but haven't test-ridden it.
There is currently no choice in colour temperature - they are 6000 K and that's it. I'd prefer something in the 4500 K range but that's a minor niggle.