No turn signal bulb is anywhere near 50 watts.
Led turn signal bulbs with built in resistors.
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Led turn signal load resistor wiring diagram stop turn signal a typical load resistor for a 21 watt turn signal light bulb would have a rating of 50 watts 6 ohms.
Also my resistor is 6 watts not 6 ohms.
According to your calculations the resistor will be dissipating more power than the original bulb.
Buy siriusled 1156 anti hyper flash built in load resistor true 25w amber extremely bright led bulb for turn signal only 1156a 7506 pack of 2.
The optional sylvania load equalizer can be used to eliminate the hyper flash higher frequency turn signal caused by led replacement bulbs in some vehicles.
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Of course make sure you re buying a quality bulb that will last a long time most companies will advertise that their led turn signal bulbs will last around 30 000 hours.
Those other resistors need to be 50 watts because they have too little resistance.
Corrects hyper flashing and bulb out warning caused by led replacement bulbs.
Though please check with your supplier.