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DANIU Lighting LED 5X 740mm Magnifying Glass Desk Lamp with Clamp Hands USB-powered LED Lamp Magnifier with 3 Modes Dimmable
₹3,013.02 ₹3,857.59

Q: Am curious: how can a USB port (which is rated at 5 watt) supply the power to a 12 watt lamp???

Asked by Gunter on 2020-01-11 12:04:15

arowland I think you have confused your units. A USB 2 socket can deliver 0.5A at 5V, which is 2.5W. A long way short of 12W! USB 3 raised the current to 0.9A (4.5W) and 3.1 to 1.5A (7.5W), though some fast chargers these days supply up to 2.5A (12.5W), e.g. the sort many tablets use. So make sure you use a suitably rated power supply! A = amp (current), V = volt (voltage, obviously), W = watt (power). W = V x A. It isn't 'fantasy', ilbrunello, it's maths!

2020-09-30 07:13:14 Helpful (4)
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Answers (4)

Gunter Didyou notice the different supply voltages between Green, and yellow/red?

rallyman 10/12/2018
THe 300 green ones are fine!~ The 300 yellow and 300 red LED's are all DEFECTIVE AND DO NOT WORK!! Please send me replacements right away!!
100pcs 2x5x7mm Rectangular Square LED Diodes Water Clear DIY Lighting
₹268.38 ₹449.29
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Comments (3)
Gunter 24/05/2018
Please note that the operating voltage is 2.8 - 3.2 Volt, not 1.8 - 2.2 Volt as per description.
1000pcs 20Ma F5 5MM Transparent Ultra Bright White LED Diode
₹1,551.09 ₹2,228.47
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