this post was submitted on 11 Jul 2023
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Mildly Infuriating

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Why does every small appliance or useful home electronics item have the BRIGHTEST LEDs in them?

I bought a new fan for our bedroom Sunday. It has 4 speed settings, and LEDs to display which setting you're on.

Just like every other electrical device in our bedroom, I had to cover the LEDs with electrical tape because they are TOO DAMM BRIGHT. That one light was more than bright enough for me to see in the room with all the lights off.

I can't sleep well if there's a lot of light like that, especially blue light, and it's like every fucking electronics manufacturer used the same extra bright blue LEDs.

All of our power strips have them. Same brightness.

The fans have them.

Don't even get me started on digital clocks and the plague of bright LEDs that they bring about

Many charging plugs have them built into the plug itself.

Even some fucking light switches have them now!

I have about 6 different things in our bedroom that have electrical tape over their completely unnecessary LEDs.

Why has this become such a common thing? Is this really something most people want? To have a room that is never actually dark even with the lights turned off?

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[–] Veraxis 44 points 11 months ago (1 children)

Electrical engineer here who also does hobby projects. I'm with you. I think some of the reason may be that modern GaN-type green or blue LEDs are absurdly efficient, so only a couple mA of drive current is enough to make them insanely bright.

When I build LEDs into my projects, for a simple indicator light, I might run them at maybe only a tenth of a milliamp and still get ample brightness to tell whether it is on or not in a lit room. Giving them the full rated 10 or 20mA would be blindingly bright. I also usually design most things with a hard on/off switch so they can be turned all the way off when not in use.

Of things I own normally I also have two power strips with absurdly bright LEDs to indicate the surge protection. It lights up my whole living room with the lights off. If I had to have something like that in my bedroom, I would probably open it up and disconnect the LEDs in some way, or maybe modify the resistor values to run at the lowest current I could get away with.

I feel like designers have lost sight of the fact that these lights are meant to be indicators only-- i.e. a subtle indication of the status of something and not trying to light a room-- and yet they default to driving them at full blast as if they were the super dim older-gen LEDs from 20+ years ago.

[–] [email protected] 15 points 11 months ago (1 children)

I think it's a cost thing. It's cheaper to get these blue LEDs than the old, dimmer green ones, so they buy these instead and change nothing else. It would cost money to change the resistor value, so they don't bother. Instead they take the same boad, stick the new LED on it, and ship it that way.

[–] Veraxis 6 points 11 months ago

I could see that being the case for some things, at least in cases where it is an older design being updated or VE'd. Perhaps some sourcing person changes the LED part number on the AVL and forgets to check with engineering whether the resistor value which goes with it is a sane level of brightness still.