This was discussed extensively on overgrow and did not see any conclusive evidence. Don't see the point in depriving the plant of energy at the most important part of the cycle
Bluefunk Reviewed by Bluefunk on . turn the lights off altogether for the final 2 weeks? I got this on this site: http://www.white-widow-seeds.com/ Quote: "Flowering Time: On both mediums it is suggested to flower (12 hour light) the White Widow for 8 weeks, but 10 weeks will really give you the crystals you are after. We suggest the final 2 weeks of the flowering cycle to turn the lights off altogether - or at least down to 8 hours. This keeps the flowers from regrowth and stresses the plant into giving up its last drop of goodness as crystal to protect the flower...try it!" Rating: 5