expired Posted by Meowssi | Staff • Feb 4, 2025
Feb 4, 2025 1:24 AM
Item 1 of 1
expired Posted by Meowssi | Staff • Feb 4, 2025
Feb 4, 2025 1:24 AM
6-Pack Uigos Plug-in LED Night Light w/ Dusk to Dawn Sensor
$6.00
$13
53% offAmazon
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Consume more power OFF than ON
Reviewed in the United States on December 4, 2023
I tested these with a multimeter and discovered that the electric current increased when the light turned off, rather than dropping to near 0, as I expected it would. Curious, I took one of the night lights apart and realized that in order to save some money on parts, they had simplified the design, consuming power in a dummy component when the light was supposed to be OFF rather than actually switching off the circuit. The ad suggests that the night light saves energy and only costs 20 cents to operate each year, but based on my measurements, it is more like several dollars per light. I am giving this product one star for a "bad" energy design, as it would have literally cost purchaser less to operate if the night light simply never turned off.
This product claims "Max 0.5W" but it's actual wattage is over 1W.
Actual wattage is 1.104W (9.2mA) when light is on and 1.128W (9.4mA) when light is off. This means electricity is re-routed to a circuit that wastes energy when it senses brightness. Apparently, this way costs less for the manufacturer. So, CAUTION: this night light does NOT save energy when the light is off.
If you leave one of these night lights plugged in all the time, annual electricity consumption will be about 9.78KWH (1.116W x 24h/day x 365days), not about 2.19KWH (0.5W x 12h/day x 365days).
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I use these when I travel as well. great nightlight for hotels instead of leaving lights on especially when you have little children.
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This product claims "Max 0.5W" but it's actual wattage is over 1W.
Actual wattage is 1.104W (9.2mA) when light is on and 1.128W (9.4mA) when light is off. This means electricity is re-routed to a circuit that wastes energy when it senses brightness. Apparently, this way costs less for the manufacturer. So, CAUTION: this night light does NOT save energy when the light is off.
If you leave one of these night lights plugged in all the time, annual electricity consumption will be about 9.78KWH (1.116W x 24h/day x 365days), not about 2.19KWH (0.5W x 12h/day x 365days).
Thank you for running the math and other background info on these. I was curious what the total impact on my wallet would be from the wasted electricity.
To add a little more math for folks based on the above.
9.78KWH X $0.1654 per KWH - $1.62 annually.
Or $9.71 annually for the entire pack.
Assuming these last 3 years and a quality one that consumes 1/3 of the energy would last 5 years, we should look for said quality one at the price of ~$5 each in order to break even.
Now I just need to find ones for less than that to find a slicker deal.
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