Nice plant. I'm going to do a DP Blueberry on possibly my next grow. I do have a couple of suggestions. Is this a closet grow? If so you can help your light situation considerably with a flat white paint on the walls or use some other reflective material but don't use aluminum foil. Also another thing that works great is to mount some floro fixtures vertically on the walls so the plant receives light over its entire length. I've grown for years without any overhead lights at all. Very nice job-plant looks very healthy
the inconsistent and inevitably crinkled surface creates "hot spots", basically it doesn't reflect evenly
From my understanding its because Aluminum foil actually absorbs more light than it reflects. The same holds true for gloss white paint and mirrors. I don't really understand it but thats what I came up with when I did a search on the relective properties of various material a number of years back. I use mylar in my room but I wouldn't recommend it because its impossible to clean. If I were to do it over again and for the sake of simplicity I would just paint the walls a flat white. Just my opinion.why not use aluminium foil ?