These produce near daylight quality light. Very interesting...
https://www.youtube.com/watch?v=L3LWXznJx_0
I know good light can be very dependent on kelvin temperature. It has to match the kelvin of the sun. This seems to be using technology i never heard of before or that i forgot about. Lumens are another key to good imitation sunlight. How bright the light arrays have to be. At the moment i use phillips led bulbs that have a led light array shaped like a ring. The output is good but not great. They only come in two watt types, 40 and 60 equivalents to incandescent and two kelvins, warm (a dimmer yellow-white) and cool (a pure bright white), so nothing like true daylight.
I still miss incandescents, nothing quite like them. CFL's, compact florescents are horrible lights. I am relieved that those are going away.
Thanks, these will be very useful for photography etc, or a killer torch!! :)