Improved lighting-Which choice
The difference was even greater than I expected, with the familiar E-code low-beam pattern that provides a sharp cut-off down the road which puts the light where needed without blinding oncoming drivers. The high-beam gives much more "seeing distance" than the non-fluted HD headlights made by North American Lighting. These e-code lights have no bling effect and look like any other fluted automotive headlight, but they do work well, and at $33 are the best bang-for-the-buck available IMO. They are not legal for use in the U.S., but I'd bet nobody will have trouble as long as they are aimed properly. You can buy Hella 80/100w H4 bulbs from the same outfit (here) for $8 plus shipping.
There have been other threads here on the pros and cons of using 80/100w bulbs, the main concern being the amp draw on low-beam using passing lamps. Adding 2A to this circuit probably won't cause problems, although the current may stunt some of the effect of the higher-wattage bulbs on low-beam. I doubt it since the 16-gauge wire should be good for that load. The high-beam circuit can handle 100w for certain as long as no other load is added to it.
In any case, a relay could always be used to negate problems on either circuit. I installed a standard automotive relay on the passing lamps (37.5w each) of my old RK, which otherwise would trip the breaker too often when the passing lamps were running with an 80/100 or 90/100w bulb (I used both). A bike without passing lamps (like the SG) could get away with 100/100w bulbs if you could find them. They do make 100/130w bulbs, but I would go more conservative unless you want to install dual relays.
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I fitted one some years ago to a bike and didn't get the gains I expected, because the wires couldn't supply the power - they got pretty hot too!
To answer the question about the latest type of bulbs, look at the temperature equivilent of the element. The higher the temperature (say 4,000deg or even 6,000) the brighter the light. These bulbs do not necessarily take higher power.
I have just bought Osram 'Night Breaker' bulbs for my Buell, at 55w each.






