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Comment by reisse | Hacker News Reader

This is due to different CRI (basically, how even light output is distributed across wavelengths), not due to PWM.

Hue bulbs have pretty bad CRI actually. They only claim >80, which almost any LED bulb is capable of these days. A good LED bulb (include those made by Philips these days) have a CRI >95.

Depends on the bulb. For those of us with "fast" eyes, some LED bulbs that are just fine for others are a subtly flickering infuriation generator.

You may not believe that people that can see 120->240Hz flicker exist, but we do. In this era of frequently-cheap-ass LED lighting, it's a goddamn curse.

I had to shop around a LOT before I could find LED headlight bulbs with just a fan and a bare-ass resistor for current control so I wouldn't see that forsaken flicker.

It's really bad for me as I work in an LED and LASER facility. I handle ALL the PWM stuff while everyone else handles the simple led/resistor/connector board assemblies. EVERYTHING FLICKERS.

My thanks to you for shopping around for non-shit headlights. For a long, long while it seems like every third car had strobing headlights. (Now, the primary problem is INTENSELY bright and poorly-aimed headlights. I'm not sure which is worse, to be honest... but both SHOULD be super illegal.)

> EVERYTHING FLICKERS.

I absolutely could not handle that. My sincerest condolences.

The OP was specifically talking about hue. Hue does not change due to PWM.

> The OP was specifically talking about hue.

I presume this is why you think that?

> ...between cheap LEDs and expensive ones (hue)...

If so, they're referring to the Hue brand of bulbs, rather than the color property. More evidence for the fact that they're talking about flicker is that they quoted this to indicate that they were replying to it:

> > Nah, LED lighting generally uses at least 200 Hz at a minimum. Some up to kHz. You can't perceive that.

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