You are most certainly in the minority. It seems like I'm always flashing people at night because they have no lights on.quote:
Originally posted by labman:
On my DRL less truck, I am quick to put the headlights on if it is hazy or the sun is low.
I wired a switch into the wire from the lights to defeat that on my 92 Grand Am. It didn't have DRL, and I used the headlights frequently on dismal days.quote:
Originally posted by Jonny Z:
Personally I dislike turning the lights on during the day - the displays for clock and temperature dim out and get very hard to read.
Engine efficiency for gas motors is about 30%, not 15%.quote:
Originally posted by oilyriser:
I used 15% engine efficiency, 70% alternator efficiency, and 140,000 BTU/gallon energy content of gasoline to calculate the fuel used to generate electricity in a car.
White LED lighting would reduce the lifetime cost of car ownership, and eliminate the need to change light bulbs. They can be used for DRLs, and instrument cluster lighting, but not yet for headlights, since they cannot be focussed well enough.
Low heating value for gasoline is about 120,000 BTU/gallon, not 140,000. 30% is bit high for normal car under neormal highway operating conditions. It's closer to what agasoline engine will develop at peak efficiency, Still cloer than 15% tho.quote:
Originally posted by Matt_S:
Engine efficiency for gas motors is about 30%, not 15%.quote:
Originally posted by oilyriser:
I used 15% engine efficiency, 70% alternator efficiency, and 140,000 BTU/gallon energy content of gasoline to calculate the fuel used to generate electricity in a car.
White LED lighting would reduce the lifetime cost of car ownership, and eliminate the need to change light bulbs. They can be used for DRLs, and instrument cluster lighting, but not yet for headlights, since they cannot be focussed well enough.
Seems like that fact that LED light wave are coherent would make them easier to focus.quote:
Originally posted by kenw:
"White LED lighting would reduce the lifetime cost of car ownership, and eliminate the need to change light bulbs. They can be used for DRLs, and instrument cluster lighting, but not yet for headlights, since they cannot be focussed well enough. "
why can't they be focused? Light waves are light waves.