Holley Retrobright Price Match

Car Nut said

I know some that are using these and swear by them.

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That's exactly what I'm talking about: a pathetic Chinese trinket shaped like an H4 halogen headlamp, with a not-even-close-to-grownup-reality "LED bulb". These give a random spray of light; not capable of providing even minimally adequate safety performance.

People swear by them? Yep, that's a completely different question than whether they're effective and safe (they're not). The difficulty is, what we feel like we're seeing isn't what we're actually seeing. The human visual system is a lousy judge of how well it's doing. "I know what I can see!" seems reasonable, but it doesn't square up with reality because we humans are just not well equipped to accurately evaluate how well or poorly we can see (or how well a headlamp works). Our subjective impressions tend to be very far out of line with objective, real measurements of how well we can (or can't) see.

Seriously, you are far better off with a 20-year-old pair of sealed beams than with this junk. Do not buy.