The 3157 is a clear bulb and the 3157NA is an amber color.
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For all practical purposes, they are interchangeable. To my eye the 3357 seeems to be brighter on the heavier filament. (brake/turn)
3157 is the bulb type, the "K" means the bulb is filled with the inert gas Krypton.
LED light bulbs definitely are more energy efficient than regularly normal light bulbs. Depending on the usage, LED lights can also last maybe twice or three times as much as regular bulbs. LED ones are better.
No, the bulbs are wired in parallel and the bad bulb could only affect others if it were short circuited, which occurs very rarely.
Fluoresent light bulbs are run using electricity.. phosphorescentlight are not,, they have particles inside that absorb from light sources of any kind and store it away to be used , that's why they are not glowing all the time.