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The switchback bulbs I referred to have built in resistors that work fine, for a while, perhaps 45 s?. They can't dissipate the heat for too long though, so when they heat up too much, a thermistor disconnects the resistor, causing hyperflash. They work again when it cools down a couple minutes later. They're pretty much OK, because I seldom have my signal on for more than 30 seconds or so.(For the add-on resistors, you only need about 15 W, because they're only powered about half the time during flashing.)
The switchback bulbs I referred to have built in resistors that work fine, for a while, perhaps 45 s?. They can't dissipate the heat for too long though, so when they heat up too much, a thermistor disconnects the resistor, causing hyperflash. They work again when it cools down a couple minutes later. They're pretty much OK, because I seldom have my signal on for more than 30 seconds or so.
(For the add-on resistors, you only need about 15 W, because they're only powered about half the time during flashing.)
