From the maths I've seen posted here in the past, it takes about three years for LEDs to pay for themselves (this likely applies to tail lights only). Even a ten year payback isn't bad as at least you know you won't have any blown bulbs (risk of getting pulled over etc), and if you sell the car there's every chance you can use them on your next one.
Currently all my cars have stop/ tails in LED, some globes have already seen duty in up to three different cars. I've got interior lights, reverse lights etc done as well, but I do those more at my leisure.
There's also the safety aspect of LED stop lights lighting up faster, reducing your chance of being rear ended.
I always buy the best globes I can find, around $60 for 1157's.
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