I tried with multiple power supplies. They all work fine. This ring draws 130 mA on 12 V. There is no significant heat from the product.
Good product, versatile use. The ring gives and even distributed light, I am thinking about using it for interior lightning as well. As far as I can tell these LEDs does not require complicated electronics just an adapter which gives 12 V DC. I am using mine from an old laptop power supply with a single chip 12 V voltage regulator. The simplest regulator is OK for 1 A which should drive 4 rings easily.
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