If the cups are loose in the pockets you could try folding and stapling a tuck at the top edge to tighten the opening. It might be more strengthening than putting a hole to run ties through. As to the lighting problem, if you presently have fluorescent fixtures you can try full spectrum lights like the ones used for growing plants. I use full spectrum incandescent bulbs with them and between them it comes pretty close to daylight. Also, my hood has full spectrum lights, small, but every little bit helps.
Andrea
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