Quote:
Originally Posted by Clan
A standard H7 dip bulb is 55 watts. I don't know how you can double the brightness using the same current flow..?
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Watts is the power of the bulb not the brightness and in the old days when most bulbs were a similar design with a typical design life of 1000 hours watts could be used as a shorthand for brightness.
You could in reality have a 100 watt bulb with a very thick filament producing very little actual light that would last years or by contrast you could have a bulb with a very thin filament producing loads of light but might only last an hour (as in some bulbs used for photography) So same wattage but maybe 10 times as bright in Lumens (a measure of brightness)
There is no doubt a specification for automotive bulbs but from a physics point of view watts is power not brightness.
Now to confuse things even more we've got led lights so watts are even less relevant perhaps it's time we started using lumens.