They glow. Yes, but if you really need a brighter light, DO NOT BUY IT! I am currently using them on my 1986 944 Turbo replacing the H3 halogen fog lights. With the factory fog lights, it was possible to drive at night with only fog lights. These LED "super bright upgrades" are dim, look cool, but they're not super bright. So please, if you use your headlights to drive, throw those lightbulbs away. Looks cool but not bright
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