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The color rendering index of low pressure sodium bulbs is vastly inferior to that of a typical white LED. High pressure sodium bulbs are even worse in that rega
by babypuncher 8y ago
The color rendering index of low pressure sodium bulbs is vastly inferior to that of a typical white LED. High pressure sodium bulbs are even worse in that regard.
- function_seven 8y agoFor backlighting LCD screens, sure. But for street lighting, I don't want a good CRI. I want to minimize blue light, harsh shadows, and glare. The old yellow sodium lights were nice. The new LED streetlights around me are terrible.
- stfp 8y agoThey really really suck! Walking at night is a pain in the eyes for me now.
- Itsdijital 8y agoI call them retina burners. A new supermarket by me installed all LEDs for the parking lot, and used warm white ones. You wouldn't even be able to tell they aren't incandescent without looking. I really hope more word gets out to not use "bright white" LEDs for outdoor lighting.
- mixmastamyk 8y agoThought they were more of a peach color.
- babypuncher 8y agoIt depends on the type of sodium lamp. High pressure sodium bulbs emit light in an extremely narrow bandwidth around 589.3 nm, earning them a color rendering index of -44 (out of 100). Low pressure sodium bulbs broaden this range enough to earn a CRI of 24. These are the peach colored ones you are familiar with.
- jedberg 8y agoThat's exactly why the light quality of sodium is better. Because at night you want yellow lights so you don't screw up the sleep patterns of both humans and animals.
- Angostura 8y agoMost people aren't trying to get to sleep while driving. For the rest, there are curtains.
- Jill_the_Pill 8y agoAnd for the animals?
- deleted 8y ago[deleted]
- dymk 8y agoWhat animals in the heart of the city? Rats and pigeons?
- Jill_the_Pill 8y agoLED lights are now common in suburbs as they sprawl into habitats. Migrating birds get confused as they fly over cities. Coastal cities and towns mess with aquatic animals.
- stfp 8y agoCity streets aren't highways. The white/blue lights are harsh on eyes, make things look bleak, and are actually not better for visibility.
- Zak 8y agoIt's generally my experience that street lighting is not very helpful while driving. It often reduces the contrast ratio between an object illuminated by my headlights and the background as well as the light fixtures themselves being a source of glare.
- AJ007 8y agoSome people would like to have a giant daylight lamp shining in their bedroom window. I always wondered who those people were.