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 Post subject: Filters on LED lamps
PostPosted: Sun Sep 03, 2017 6:28 pm 
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The switch from sodium-based lighting to LED is quite shockingly fast in my area; a nasty surprise if I do say so. What I want to know is, rather than going straight from orange to bright white (which has been said to cause some issues with sleep; not to mention that it, in my opinion, looks ugly and unnatural), why can't they install orange/yellow filters on the fixtures? That way the government can be satisfied with their energy advantages, and the populace isn't too disturbed by a sudden change. Somehow that orange tint was part of the nightlife. Now it's all blindingly bright and shiny; not at all what night-time should be. Also, wouldn't the orange light be easier to work with for astronomers?

I don't know the technical or logistical feasibility of this; after all I'm simply nostalgic for that orange glow. Sad to see it go.


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 Post subject: Re: Filters on LED lamps
PostPosted: Sun Sep 03, 2017 6:49 pm 
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White light LEDs are the most efficient from a power to lumen point of view. White light is also perceived by the eye to be brighter, which allows a reduction in lumens compared to SOX or SON.

British Standards also state that monochromatic light is to be avoided to ensure better colour rendering - red colours look black under SOX for instance.

More of sn issue - and one which your area may/seems to suffer from - is LED retrofits to older columns with either a too high lumen rating, or not considering the effect of the existing bracket on optical performance, both leading to glary lighting.

As for astronomy, the sheer amount of uncontrolled light at night is the main problem -
streetlighting is only a fraction of this light pollution. This makes astronomy now impractical in built up areas.

The orange/yellow glow is also only fairly recent, lighting before was either mercury or incandescent, and going further back, moonlight is white light.  ;)


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 Post subject: Re: Filters on LED lamps
PostPosted: Sun Nov 12, 2017 4:49 pm 
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So is sodium lighting going to disappear forever?


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 Post subject: Re: Filters on LED lamps
PostPosted: Wed Nov 15, 2017 10:56 pm 
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Phosco152 wrote:
The orange/yellow glow is also only fairly recent, lighting before was either mercury or incandescent, and going further back, moonlight is white light.  ;)
Candlelight? Kerosene lamps? Torches?


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