I wrote a automotive lighting expert about this discussion and here is his response:
On Nov 22, 2013, at 11:30 AM, Consult Daniel Stern Lighting<
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"LED bulbs" such as you describe are a joke. A toy. Not a legitimate product. They do not produce even a tiny fraction of the amount of light required for the low or high beam function, and the paltry light they do produce isn't even remotely close to being distributed correctly.
More generally, "LED bulbs" are not safe, effective, or legal in _any_ of a vehicle's exterior lights. Each and every vehicle lighting function is regulated in detail as to intensity, intensity ratio, color, vertical and horizontal angular range of photometry, etc. The lights don't (can't) work correctly or safely if the wrong kind of light source is used. Lamps designed for filament bulbs _must_ use filament bulbs.
And since we're on the topic and some "bright spark" is sure to bring it up: "HID kits" in halogen-bulb headlamps or fog/auxiliary lamps (any kit, any lamp, any vehicle no matter whether it's a car, truck, motorcycle, etc.) do not work safely or effectively, which is why they are illegal. See http://www.danielsternlighting.com/tech/bulbs/Hid/conversions/conversions.html .
You can reduce the power consumption of your headlamps somewhat by installing Osram/Sylvania EcoBright or Philips EcoVision bulbs (9003 or H4, same fitment). These are a variant form of the bulb, designed to produce the appropriate amounts of light while drawing less power.