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700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
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940 headlights very dim with ageViews : 7312 Replies : 91Users Viewing This Thread : |
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Jan 15th, 2020, 21:29 | #91 | |
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For the rears and sidelight/indicators, most of the time you're right, they use fairly generic LEDs of differeing designations and Lumen outputs. By using the right number of them and the right brightness (in Lumens = Lm), it's possible to recreate the right sort of light output from the indicator, sidelights, stop, tail, reverse lights etc. The normal LEDs that we use for other things have a Vf (Forward voltage) of about 2.4V but most of the white ones for LED bulbs (and also the orange and red ones for automtive lamps) have a forward voltage (Vf) of 3.6V - multiply that by 4 and you have 14.4V so often the clusters of LEDs for LED bulbs are arranged as 4 LEDs but sometimes they will do 3 (10.8V) with a series resistor as a safeguard against voltage spikes on the system. Generally speaking, you get what you pay for though, the correct LED headlamp bulbs aren't cheap but 6 years on are still just as good as the day they were fitted, no loss of output and an added bonus is the headlamp lenses stay cleaner!
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Jan 18th, 2020, 18:20 | #92 |
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I have just found this post, cheers!
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