Several people have been stating that electric blue enriched white light, which can be considered 5000K or higher, for interior lighting is bad and may even damage health. Most of them have been siting various references. But all of the references that I checked out so far are significantly flawed or are not that valid for typical human beings.
One example is trying to use the Kruithof effect, which states that people prefer warm color lighting when there is low light level. Although it has been replicated by some, it has not been replicated by others, who found that Illuminance dominated color temperature. The IES has stated that this should be treated with some skepticism. There may also be the factor of billions of people in or from the Asian Pacific Rim, who are used to high CCT in most all applications.
Another example is what may be valid for nocturnal albino rats is often not valid for people. If any of you think you have some good research documentation showing that blue enriched light from typical LED or incumbent fixtures is bad for eyes or general health, please let me know. You do not need to send anything about blue enriched light should not be used one to two hours before going to bed, because it is accepted that can cause melatonin suppression, which can make it hard to fall asleep.
Also if any of think that typical LED fixtures are worse than similar incumbent technology fixtures, please provide what you think is good scientific evidence for that. Blue enriched light, when used properly, can be so beneficial, because it can improve circadian rhythms, short and long term alertness, visual acuity, performance – productivity, sleep, etc. For example, the visual acuity benefits of high scotopic/photopic lighting, which is usually high CCT, have been scientifically proven. I was involved with the first two phases of the DOE research, and the protocol was properly designed to avoid the Hawthorne Effect. You check the protocol yourself. You could also check out IES’s TM-24-13, which has a long list of good references.
Let’s use some common sense. How can blue enriched electric light be bad when daylight has so much of it, and human beings have survived and thrived for about 200,000 years with daylight, which is up to 14,000K and 10,000 fc? If you want a place to get good and unbiased information, please contact the Human Centric Lighting Society and its Committee. Since the Society became a legal nonprofit the website switched from .com to .org. http://humancentriclighting.org/