Hi Guys, I am new on here and to growing so thanks for having me on board. I am in week six of my first grow using a 600w multi spectrum lamp. Which has done the job pretty well so far. My plants are now getting to the size where a few of the lower leaves are going yellow due to not getting enough light. Is it worth putting some extra lights in to light all the plant or as its my first grow not over complicating things and just cut the yellow leaves away. What additional lights do you guys recommend? I need something that lights off as least heat as possible as my groom is in the loft so on hot days (Not that we get too many in the UK) it can become a bit warm despite a half decent venting system. The three plants I am growing look healthy enough, its just I would like to get as much out of them as I can. Thanks in advance!