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numberonekiwi

147 posts

Master Geek
+1 received by user: 8


#249162 28-Apr-2019 18:59
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I am replacing some lights at home with LED and when reading the specs on the bulb a 10.5 W LED  has a voltage rating of 220 - 240 V at 95 mA that is a lot more than is between 21 and 23 Watts of power draw still a lot less than a 100 Watt roughly equivalent bulb so for those that are totally into power saving this would be slightly less saving than they had planned. Has anyone else noticed this and is this actually false advertising ? 

 

 


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Aredwood
3885 posts

Uber Geek
+1 received by user: 1749


  #2227045 28-Apr-2019 21:36

It would be due to power factors.

In AC circuits. You multiply Voltage X Current X power factor to get wattage.

If the load is resistive (filament lamp, heating element etc) then the power factor is 1.

Lots of cheap electronic devices and small electric motors. The power factor is often around 0.6 But it can easily be better or worse.

if we calculate 220V X 0.095A X 0.5PF = 10.45Watts.

So the manufacturer might actually be telling the truth.

But to confirm. You will need to measure the actual power used. And the light output. To make sure that they haven't taken a 5W or 7W fitting and labeled it as a 10.5W fitting.






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