Quemazon, irritating drivers with a light has more to do with the angle at which you direct it. If you have it aimed too far out front it will be shining directly in the eyes of onecoming drivers. Just point it down so that the main part of the beam is directed just a few yards in front of you. It will still be quite visible to oncoming drivers without being blinding.
LED MR16 replacement bulb. Well, I got my 48-LED MR16 replacement and tried. I am underwhelmed. It does produce quite a bit of light, but the light is too diffuse. It makes more of a smudge of light than a beam. This particular bulb seems to use pretty vanilla LEDs, ie they may not be "high intensity". The beam of my Cateye EL300 (5 LEDs) seems slightly brighter, but the beam is extremely tight. It is hard to say which puts out "more" light. I took the 48 LED bulb out after one morning ride.
FWIW,
Raymond
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