General > General Technical Chat
Sign of the times
james_s:
--- Quote from: penfold on May 16, 2021, 06:55:51 pm ---The one complaint I have with the LEDs is that without the diffusers, (living in a particularly hilly city) when driving up-hill they do appear quite dazzling and the more distant ones can be difficult to distinguish from an oncoming headlamp at first glance especially when there's a reflection from a window.
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I live on a big hill and this still annoys me, I have gotten in the habit of looking away from where I know the streetlights are as I drive up the hill. Also a couple of trees have grown considerably since the LEDs were installed and that mitigates the glare too. The glare is a consequence of the FCO mandate and excessive light levels due to lumen standards that were created assuming HPS.
Red Squirrel:
I think the diffusers would actually REDUCE light pollution by making it more even instead of causing bright spots.
If you look at this long exposure for example you can see how the houses near the lights are very bright compared to ones not directly under, I guess it's hard to compare as I don't have a similar pic with the orange lights but I feel with a diffuser the lighting would be a bit more evened out. Those bright spots are more visible from the air as well and the light reflects back upwards as the street also has a very bright white spot directly below the light. The orange light was a bit more subtle and also less hard on the eyes.
Zero999:
--- Quote from: Rick Law on May 16, 2021, 07:23:46 pm ---
--- Quote from: RichC on May 16, 2021, 12:59:56 pm ---
--- Quote from: Rick Law on May 14, 2021, 08:31:04 pm ---The most common color blindness is red-green (8% of male, 0.5% female for Northern European descent according to Wikipedia), next to that is blue-yellow. Yellow, orange, amber are colors are a mix of red and green, so it is unfriendly to decreased sensitivity to red-green. The traffic light colors are even less friendly to them, yet red-green insensitivity appears to be the most common.
It may not make any difference to most of us, but I guess only until someone runs over your dog because the street is lid with yellowish lamps.
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Sodium lamps are not a mix of red and green, they are a pure yellow (sodium lights have probably the narrowest frequency band of any lights in fact).
Also as mentioned colour blindness is about being unable to tell colours apart not being unable to see them at all.
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I understand that color blindness is merely unable to distinct the colors. None the less, it does mean a degraded vision.
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No it does not mean degraded vision, it's just more difficult to distinguish between some colours. Quite often it's very mild, in which case the person only struggles with unsaturated colours, in poor light.
--- Quote ---When you have two cars or of similar color, it is hard to make it out as two in low light.
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That's true for everyone, even more for those who are colourblind.
--- Quote --- Not being able to distinct 1/3 of the color, it may that distinction even harder. It would be like: "That car split itself into two and one went straight and the other one hit me..."
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What do you mean? You do realise that most people who are colourblind have as many colour receptors, as those with normal colour vision. They're just the wrong colour, which skews their colour vision slightly. It doesn't reduce their sensitivity to light.
james_s:
--- Quote from: Red Squirrel on May 18, 2021, 12:14:36 am ---I think the diffusers would actually REDUCE light pollution by making it more even instead of causing bright spots.
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I agree, more even lighting would allow the use of less light to achieve the same result. The law says no light emitted above 90 degrees though which effectively bans drop-lens diffusers, and like many laws, it was based on good intentions but brings unintended consequences.
Sal Ammoniac:
Why do we feel the need to light up everything at night? We're doing irreparable harm to many animal species that evolved in dark night skies. Human hubris at work... :palm:
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