In my July 18th column, online at www.JimSmithColumns.com, I wrote about my favorite home improvements, including the adoption of LED lighting, which I prefer to CFL lighting and is far more energy efficient than incandescent lighting. In particular, I wrote glowingly, so to speak, about “daylight” LEDs — the whitest light available, so well-named for how it matches the color of bright sunlight.
In our office, I replaced all our “soft white” LEDs with “daylight” LEDs to match the color of sunlight coming through our four Velux sun tunnels.
A reader of that column alerted me to some recent research which showed “daylight” LEDs to be harmful to vision, exacerbating macular degeneration, and disruptive of our circadian rhythm (important for good sleep) specifically because it simulates full natural sunlight.
I urge you to Google “daylight LEDs and health,” as I did, and you’ll find that one of the top links is for a June 2016 American Medical Association policy statement (adopted unanimously at their annual meeting) warning about health and safety problems associated with white LED lighting, so common now in the lighting of American streets.
It was right after learning of this research that I bought a new HP laptop computer and noticed that it offers a “nightlight” setting which automatically changes the screen lighting from white to yellow LED light at sunset. It made me wonder why I was so late to learn about this issue!
The reader who alerted me to this topic suffers from early stage macular degeneration. He said he has replaced all the LED lights in his home with incandescent bulbs. I’m satisfied that changing back to the lower “color temperature” LEDs will be enough. I have noticed that some LED fixtures (like the ones I installed in our conference room) have a switch allowing you to choose between “soft white,” “warm white” and “daylight” temperature settings.