Electrical power calculation

The driver is using power too , could be the missing watts

Its a Cultivate 75W.And it is Brandnew. It says designed in Italy,and ofcourse production in China.Leds coming from US (Electrolux). Well,LED diodes are very stable with current flowing in them. i was expecting to read something close to 90W consumption from this. 75 coming from LEDS,10W internal fan to cool'em,and some thermal losses from converter ac/dc,small other parts inside stabilising voltage etc. But my readings were lower.

Cpu.. Video... Cell Phones.. All sorts of stuff that you would assume is exactly the same has subtle and slight variations across the entire production run. It's just a part of mass production.

Are you wondering each one of the 3w Leds doesn't use the exact same amount of power? Keep in mind when buying anything it's always a kind of guide line.. Like if I buy a 60w light bulb it's around 60w... Every bulb is different. When making hundreds of anything at one time you have variables and differences. I'd say 58.3 to 75 is close enough... Even when you buy a motorcycle they list em at 250cc but they are always 249cc as an example... People like to know numbers and such so they give us numbers to make us happy little creatures but again there is always Variables or differences.

@Carlotta Hey there, Which light is it, is it a brand, or homemade? I could have a look if you tell me the type of light. Cheerz OimRausch