You're all set!
You can access your copy of Photobiology: A 101 Course here at any time.
You might also be interested in:
Guide to Selecting a Grow Light
Choosing the best grow light for your environment depends upon your awareness of the issues involved and the science that makes it all work.
LED vs HPS: A Cost/Benefit Analysis
A side by side comparison covering a span of five years. Let’s talk numbers, your bottom line, and doing it right the first time.