Used Auto Parts Seattle

Q.what's a good driving light for in-town use?

A.Used Auto Parts SeattleA thoughtfully-selected, properly "fed" (wired), properly aimed set of low beam headlamps. "Driving light" is an obsolete term, but it will be around for many years to come. It refers to auxiliary *high beam* lamps, never safe or legal for use with low beams or in traffic. You're confusing "driving lights" (auxiliary high beam lamps used for extra-long-distance illumination on dark, empty roads) with Daylight Running Lamps (lamps used for vehicle conspicuity in the daytime). Headlamps, driving lamps, fog lamps, etc. are all run at rated voltage. Some Daylight Running Lamps are implemented by running the high or low beam halogen headlamps at reduced voltage. If the voltage is reduced to no less than 70 percent of rated, the halogen cycle will function and bulb blackening will not occur. If, however, the voltage is reduced to levels much lower than 70 percent of rated, the bulb glass will not attain the necessary temperature for the halogen cycle to occur, and the bulb walls will become coated with tungsten boiled off of the filament. Such bulbs do "clean up" with prolonged running at rated voltage, but it takes quite awhile and if the boiloff is severe, they won't clean up or the filament will "neck" and fail. This is the "gotchya" of high-beam DRLs: If you reduce the intensity of the high beams enough to avoid glare, the horizontal angle of visibility of the DRL is very narrow and the bulbs blacken. If you run the high beams at a high enough intensity to get some horizontal visibility and avoid bulb blackening, the DRLs produce massive glare on-axis. Find good used ones via www.car-part.com, searchable used auto parts nationwide.

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