Funny they tested sunlight through glass, not direct sun.
Glass removes most UV and a lot of the useful spectrum.
Yet it still outperformed artificial lighting.
Even the DILUTED version of sunlight...
LEDs weren't engineered to replace sunlight, we engineered them to various colors so we could see things without them looking red (the original LED color).
We do have wide-spectrum lights, and using various combinations can get close to the spectrum width of the sun (not exact), but they are made from glowing gases, not LEDs.
We do have wide-spectrum lights, and using various combinations can get close to the spectrum width of the sun (not exact), but they are made from glowing gases, not LEDs.