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Considering one LED: 12V x 20mA = (12) x (0.02) = 0.24 watt

If LEDs are identical, and every one of them draws exactly 20 mA at 12V,

then 60 of them want to dissipate

60 x (0.24 watt) = 14.4 watts .

A power supply rated 12 watts will sag in voltage, or, if regulated,

will get quite toasty, and is likely to fail.

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