no prob.....I would try to put them under for 24hrs for 7days or 20-4 for a week......just to give them an extra boost....How far were ur lights? I keep my cool blues about 3 to 4in away max..... u want the light close but not that close to burn them.....the browning of the leaves might be a ph problem....need to check that asap before u start adding any nutes...here is a pic of one of my plants blueberry strain..in first week of flowering:thumbsup: