Incandescent lighting improves perception of both blue and red colors equally, while LEDs primarily improve blue perception.

“These characters, their perception of blue and red both improved to the same extent and it was very significant.”

“Then we came back and we measured their color perception again and we got so much better an effect than we ever got with reduced spectrum longwavelength LEDs. It was well I made us go back and do all the analysis again. I was really surprised. So with the with the LEDs, what you tend to do is the long wavelength ones. You improve your perception of blue a bit more than your perception of red and there's a bit of a complex story and it's all over in 5 days. These characters, their perception of blue and red both improved to the same extent and it was very significant. And then we took the bulbs away and we thought, well, we'll come back six days later and we'll see where they are. We came back, they were exactly the same. They hadn't the perception had declined. >> The improvement was maintained. >> The improvement was maintained. We went back a month later, the improvement was maintained. We went back a month later, the improvement was maintained.”