I like that here in the U.S. we are always debating the correct light, where in other places they are so far beyond light. They have moved on to "light recipes" where they simulate sunrise with a spectrum to wake plants up faster in the morning, which gives the plant more of the 12 hour light cycle making food. They simulate sundown in much the same way, to get the plant to sleep faster and have it doing maintenance on itself sooner in the dark cycle. A computer captures light intensity information throughout the light cycle and adjusts to the perfect night time temperature, for that particular day, to produce maximum sugars. And much more.
So, someday we will be discussing the best recipe, for White Widow, in the 7th week of the flowering period. I can't wait. Rock on.