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Headlight Corrosion - can it be reduced or prevented?

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Old Sep 14th, 2017, 10:38   #51
Stephen Edwin
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Originally Posted by rtbcomp View Post
I think there's a law about the maximum wattage light you can have on when you're parked, and IIRC a 21 watt light (or equivalent) would be illegal.

If I can get my hands on a current up to date copy of Wilkinson that should have the answer. Otherwsie I could try to use the British and Irish case law online database.

The when parked issue is an issue. The original wiring was 5/21 for good reason. When parked as opposed to stationary with the ignition still on.
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Old Sep 14th, 2017, 21:44   #52
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OK Peeps , my LED side lights are W5W COB with the light emitting sideways , becasue of the colour temp 6000K the light "appears " brighter . BUT & here comes the headache bit , they are equivalent in lux output . Also due to the sideways direction of the LED output , more of the reflector is acted upon .

Lux (lx) measures illuminance, which is the amount of light on a surface per unit area. A single lux is equal to one lumen per square meter. If the lamp displays its brightness as a measurement of lux, it usually lists a distance from the bulb since any change in distance or bulb type changes the lux level .

Legal maximums wattage for incandescent bulbs

side / tail light 5W
indicator side repeater 5W
number plate 5W
Stop / rear fog / indicator ( front - rear ) 21W
Headlight dip 55W
headlight main 60W
Front Fog 55W ( not checked during MOT )

Bought my W5W LED's from angemart1999 via amazon , have had cheaper & generally rubbish ones previously

rtbcomp , parking lights are 5W maximum as it utilizes the vehicles own sidelights , please see the above bulb list
To stupidity & beyond
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Old Sep 19th, 2017, 12:26   #53
Derek UK
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This discussion will run and run, as it has elsewhere on the web. Remember that you can buy normal bulbs that have a higher light output than that of standard ones but are still rated at the same wattage. Although it doesn't matter for some lights, the effective efficiency of a light depends on the filament position relative to the reflector. This is critical for headlights. You may get a nice pool of light but it has to be correctly positioned for the reflector to direct it correctly through the lens which itself defines the beam pattern.
LED bulbs, especially those with multiple panels will make lots of light but be unable to produce the same point source as a filament to create a proper beam. Think about the 2 filaments in a standard bulb giving the main and dip beams that give completely different beam patterns. These filaments are about 2-3mm apart. Think about that when you are looking at an LED bulb with several panels.
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