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What silicon?LEDs are made of things like gallium arsenide. The energy cost of producing them is high but they last for a very long time. It might just make sense to replace street lights with LEDS and, as the cost of energy continues to rise, the case gets better all the time.
Is it possible? would this be more cost effective than the present lighting?
Do sodium lights give off any heat? This could also be another factor in efficiency.
wonder if they can use Xenon gas in street lights as they seem all the rage with cars.
on the other hand, they do give some improved colour vision, which must be a benefit
When driving a car, however, you have different requirements for your vision than when you are in a situation where colour vision is a benefit. You have to deal with a very contrasty scene and startlingly bright blue lights are a serious disadvantage for this. The beam pattern that you can get with point source QI bulbs can be much better controlled than using the old frame type filaments. But the high intensity in the centre of the beam can seriously affect the vision of oncoming drivers., when it hits them, even briefly.The new lamps are a damned nuisance, in many ways.
(unless we are to condemn the emergency services
Quote(unless we are to condemn the emergency servicesYes - I do!. The flashing lights are much too bright at night and actually cause pain!!
The 'new' lamps have point source filaments and that has a big effect on the reflector design and on beam pattern and contrast. Notice how most modern cars have tiny headlamps - because the filament is tiny and they can be made to work at that size. Good for the driver - bad for everyone else.
The colour is an issue because, at night, your eyes are adapted to low light levels and excessive blue light levels spoil your vision. If you want to navigate a boat safely at night, it is usual to have only red lighting on board.
I am not interested in getting a good match for my jumper or the paint in my hallway when I am driving home at midnight. I want to see as much as possible of the road and its dangers. Horses for courses.
But you would not be using the red light to illuminate the environment you are trying to navigate through.
Nobody would suggest using red searchlights at sea, since searchlights are intended for environmental illumination.
QuoteBut you would not be using the red light to illuminate the environment you are trying to navigate through. That is not my point. My point is that other road users (that includes you and me) will be subject to impared vision as a result of blue headlights.
Monochromaticity has nothing to do with rear fog lamps - it's the excessive brightness. Nobody is bothered by the normal rear lamps.
Are there, in fact, many situations where the actual ability to distinguish between subtle differences in colour is important in night driving? Red, green and amber lights or reflectors are easy to spot and anyone wearing dark coloured clothes - whatever the shade - is not going to be seen., in any case
But, if the disbenefits to others outweigh the benefits to ourselves, what should we do?
I am merely recommending a balanced approach in which no one car driver inflicts his requirements on others.
If on-coming drivers simply have to jack up the brightness of their lights in order to compensate from being dazzled that's just war.
Night vision goggles would be fine but they are not fail safe and they are expensive and (you may recall) they are very much MONOCHROMATIC displays and low resolution.
Other peoples' excessively strong lights don't help you to see them any more than modest lights. If everyone had the same light power, that would be the best solution.
Let's just agree that all lights should, at least, be properly adjusted and that rear fog lamps should be illegal (enforced) in anything but extreme poor viz.