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LEDs and low-power, high-efficacy, long-life light bulbs produce appropriate amounts of light for an effective DRL without significantly increasing fuel consumption or emissions.

while other research has concluded there is a safety disbenefit to two 90 mm x 520 cd DRLs on motorcycles in comparison to one 190 mm x 270 cd dipped (low) beam headlight.

Shortly after Canada mandated DRLs, General Motors, interested in reducing the build variations of cars for the North American market, petitioned the U. National Highway Traffic Safety Administration in 1990 to permit (but not require) US vehicles to be equipped with DRLs like those in Canada.

NHTSA objected on grounds of the potential for high-intensity DRLs to create problems with glare and turn signal masking, and issued a proposed rule in 1991 that specified a maximum intensity of 2,600 cd.

The dim-dip system operated the low beam headlamps (called "dipped beam" in the UK) at between 10% and 20% of normal low beam intensity.

The running lamps permitted as an alternative to dim-dip were required to emit at least 200 cd straight ahead, and no more than 800 cd in any direction.