Product Update:
The LED was getting very hot to the point where it melted my wires from pulling more voltage then my wires could handle. Its brighter but yet more dangerous if I didn't see it burning, it would of let my car burn a big hole. I have downgraded my star from 5 to 2 due to safety
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Did not get this for automotive application but rather to replace a light fixture in my display case. The Hi intensity intermediate base bulbs are expensive & fail after about 2 weeks. Any possible screw in solutions were expensive, awkward (need adapters), and too dim. @ $3.5 each this looked like it was worth a try. Result was awesome.Brighter cleaner light than the original. Drilled a hole through the old socket/reflector, hooked up to an old 12VDC/500ma adapter I had laying around, couple if dabs of RTV & done. The light is so intense that I'll need to make a diffuser from an old florescent fixture so don't get those after image dots if I accidentally look at it. While the panel itself gets pretty warm (foiled my duct tape mounting), it's nothing near the original Hi-intensity bulbs. Did not notice any significant heating of the wires, but I kept the small gauge connection as short as possible and clear of the panel. I tested current draw and found t drew around 400ma from a nominal 12VDC supply (actual was ~12.85VDC under load). That specs out to ~5W.
If you're replacing an auto bulb that is rated for less than that you might be overloading the wiring since automotive wiring is usually pretty closely margined. Since a car's operating voltage can run over 13VDC I'd say don't replace a bulb that was less than 7W, without checking the wire gauge used.
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