NOT a problem at all !!!!!!!!!!
You could even make the light schedule shorter if you wanted..

iloveLIGHT
Garden Knowm Reviewed by Garden Knowm on . extra hours of darkness - problem? hello everyone! :D so my plants are about three weeks into flowering and things are going as well as can be hoped (two happy healthy budding females :thumbsup: )... I do have one problem this weekend and was hoping to get some advice from more experienced growers... My plants are getting light from 8AM-8PM... but I will have houseguests this weekend and will need to go from stealth to superstealth... the result is that I will probably need to shut everything down at about 6PM, Rating: 5