Actual measurement of how much power consumption decreases when lowering TV brightness

2024-06-05

How much does power consumption decrease when you lower the TV's backlight brightness?

I actually measured it.

Our TV is a Sony BRAVIA.
It's a 2015 model, 40V-inch FHD KJ-40W700C.

It's a bit of an older model, but isn't that more realistic?

And here's the power meter I used for the measurement.

ELPA Eco Keeper Power Meter Checker 100V Large LCD Display EC-05EB

Initial Settings

What I'll be changing this time is the "Backlight" setting.
The initial setting was "7".

It's quite bright. There seems to be some room to lower it.

First, here's a summary in a table.

Brightness "7"	Brightness "4"	Brightness "1"
47W	38W	28W

First, with the initial setting, backlight brightness "7", the power consumption was "47W".

If you lower it too much, it becomes hard to see and feels like it strains your eyes.

The practical limit seems to be "4", at which point the power consumption is "38W".

Compared to the initial setting, this resulted in a power saving of about 10W.

This calculates to about 1 yen cheaper per 3 hours.

By the way, when the backlight brightness was set to minimum, the power consumption was "28W".

It's hard to convey in a photo, but it's very dark and feels like it strains the eyes.

With electricity prices soaring these days, we want to be mindful of energy saving, don't we?

It's said that about 5-10% of household power consumption comes from "TVs".

Let's save electricity by lowering the brightness just a little.

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