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Message: <blockquote data-quote="Archive4" data-source="post: 960664">Surely ( not shirley ) the heat generated within the bulb is more from the pcb than the led´s? Cannot ever remember coming across a hot led. My dog´s collar had several led´s and ran off a 3v lithium battery, as do many " Christmas hats " and assorted paraphernalia sold at various times of year. No heat, just pretty lights. I also have about three types of led work lights that run on standard batteries or re-chargeable, never got hot yet.Or am I using the wrong led´s?</blockquote>