Hi! I recommend to read the following link as it should answer all of your questions:
Sphag-n-Bag
The plants I have in sphag-n-bag are next to my table that has a plant light, but not directly under it and I have many plants that are growing new roots. It has taken 3+ weeks so far to see results and they will need to stay in there until the roots get a little longer (I have been told the roots need to be around one to three inches) so patience is a must, which I am short on
Hope the link to the website will help you!