Unfortunately this is how all white LEDs work, and the retention time is tens of miliseconds. It's an interesting idea though, based on the old shutter 3D goggles. Since it would rely on the eye adapting to the flickering darkness, it would be very dependent on how good the light seal round the edges of the goggles is.
(now, AFAIK there are no actual one-way mirrors, simply semi transparent (both directions) - question is if we cut 70-80% of the leds escaping, would 20-30% sunlight entering be enough?)
I think they should simply use curtains or shutters that close at night. I'm surprised a modern country like Netherlands has no laws regarding light pollution.
Plants are not narrow-band absorbers. They can utilize rather wide ranges of red and blue light. So if you blocked out a very narrow band there they would still get most of the sunlight. During the night they would simply harvest photons from those narrow bands, they don't care. But the photons wouldn't escape the glasshouse.
But yes, shutters are probably much cheaper than narrowband light sources and matching filters.
Attacks have even been brought on by passing cyclists with red LED lights.
Weirdly my older Phillips hue does not, so either that is not flickering or it is doing it much faster.
* Wild animals, don't have these glasses, so they will keep being strongly affected.
* The light get scattered on the atmosphere, buildings, clouds, etc, so a weird range of time shifts would occur.
* This wouldn't work if you are trying to do photos !
Suppose you made all your LED lights so that they alternated 2.08333 ms on, 2.08333 ms off. That's a 240 Hz flicker rate, which should be high enough that it won't bother people.
Further, suppose you synchronized the flicker of all the lights in a city so that they were all on at the same time, and all off at the same time.
Finally, suppose you made some goggles that had a shutter system opened for 1.5625 ms out of every 4.16667 ms, and synchronized it with the LED flickering so that the shutter opens 0.520833 ms after the LEDs start their off phase. The shutter will then be closing just as the LEDs turn on.
By the time the shutter opens, the LEDs will have been off for 0.520833 ms. Light travels 156 km in that time, so the last light from the on phase of all LEDs within 156 km of the goggles will have already reached the goggles by the time the shutter opens.
Question: would this effectively make the LEDs invisible to you through the goggles, while letting you see non-LED sources such as stars with no interference other than the 62.5% of their light you are losing during the times when the shutter is closed?
One problem I can see (no pun intended) is that many LED lights actually use a bulb coated with phosphors, and the LED in the bulb is used to excite the phosphors which then glow giving off the light that we see. I'm not sure how quickly the phosphor stops glowing when the driving LED turns off.