10-24-2020, 02:36 PM
(10-23-2020, 05:58 PM)danbrotherston Wrote:(10-23-2020, 05:32 PM)Bytor Wrote: Given what we already knew when the decision was made by Kitchener to start using these LED lamps about how bluer light screws with your circadian rhythms and increases the risk of many diseases, I'd say that they are definitely worse than the old orangey sodium lights in that regard.
In terms of colour temperature, yeah, LEDs were chosen with a higher colour temperature (you're right this was a choice). Whether you consider that a good, bad, or neutral thing well, I don't personally believe the data is all that conclusive--certainly there are indications that it can cause problems, but there are also some benefits (you need less light to achieve the same perceived brightness). But mostly I believe focusing lumiares onto the areas that need lighting and thereby limiting spread of light and otherwise limiting unnecessary lighting is a more important than the colour temperature, but that's merely my opinion on the matter.
Agreed. And with the higher efficiency of the LEDs and the reduced replacement frequency (and thus labour cost) of the LED lights, the cost savings is substantial.
Not to mention that no one makes low-pressure sodium lights any more, so they are no longer a viable option even if we liked that colour of light. (Of course orange light from LEDs is also possible.)