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Comment by alfalfasprout | Hacker News Reader

They don't. Even the highest end ultra high CRI bulbs don't have the same CRI and dUV as a good halogen bulb for example.

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I'd thought halogens weren't being banned, but apparently they are (in the US).

Though the concern seems to be mercury content --- CFLs are also subject to the ban, according to April 2022 accounts:

<https://thehill.com/policy/energy-environment/3463992-biden-...>

Yeah.

Incandescents were "Deprecated but still available, and not many people worried about it" for about the past 7 years or so, and you could still find them at stores, if you cared.

Trump expressed his dislike for LED and CFL lighting, so, of course, the Biden administration went about actually banning sale of incandescents. I expect a robust black market in them for decades to come.

The overall energy use numbers really depend on how the bulbs are used - in many areas, lights are mostly used in the winter, when the heat is welcome. Saving energy on lighting and having to burn more natural gas or electricity for heat pumps is perhaps some savings over electricity, but not nearly the 5-6x often cited as "savings." In the summer, when the heat is unwelcome, the sun is up longer, so a well run home won't be using nearly as much artificial light.

I’m more familiar with the advancements in CRI in recent years than dUV (this is the first I’be heard of that) but LEDs can now be purchased with equivalent CRI.

The context of this discussion is incandescent color/perception/experience.

My point is that CRI alone isn't sufficient. Nor is CCT (correlated color temperature). In practice, two bulbs with the same CRI and color temperature can have drastically different tints.

It all boils down to how these measurements work. In practice, the vast vast majority of LED bulbs do not even remotely come close to the color reproduction of halogen. Not to mention the flicker response to 60hz wall power.

There are a handful of companies that produce extremely color accurate LEDs but they're expensive and have limited lifespan.

Check out this resource for more info: https://www.waveformlighting.com/tech/what-is-the-difference... https://www.waveformlighting.com/tech/calculate-duv-from-cie...

Well OK, I was more speaking in the context of a reading lamp. And I wanted more to point out that an LED lamp with smooth color and brightness spectrums allows for you to find a better sweet spot for comfortably reading at night.

I can’t recommend Waveform Lighting’s 95 CRI products highly enough!

The wonderful warmth of incandescent (depending on your color temp prefs) with no wasted IR energy in the form of heat. What’s funny is that your mind will perceive it as hot because we’ve been conditioned to expect it from light at that color temp.

Reasonable price, too, but more expensive than bulbs from the big box store. For something that lasts 10-18 years, it’s worth it to me.

Their bulbs don't last anywhere near that long for me but I continue to buy them because nothing else comes close in terms of color rendition.

I find the 3700k is perfect for my tastes.

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