Looking good CC. I noticed with one of your outside plants you filled the container with soil only about halfway. It would be better to fill it up all the way or cut the pot shorter. Especially when they are smaller. It blocks air flow from going under the plant and light from hitting the lower buds. Also, can you remove the cover from your light? It looks like the glass is decorated and maybe lined with wire? This could be lowering the useful lumens which could explain the stretching. Was that an outdoor light from Lowe's or something? Are all your outside plants starting to re-veg now? You mentioned bat guano too. I mix in some with the compost when I make tea along with sucunat. Guano is great stuff. It has all the nutrients that your gals will need.
The problem with tin foil is that it crinkles easily and then those creases make reflective hot spots. Then you get a concentrated beam of light pointing in one spot. If it has enough light reflected back to one small point it can burn the plant. I've seen plenty of people use tin foil though with no problems. Another option is to get an emergency blanket from Wal-Mart. It's only a couple bucks and closer to mylar than tin foil in reflectiveness.
In ElTio's last pic doesn't it look like an alien craft is about to abduct a cow?