There are plenty of others, and they run the whole gamut from virtually unmoderated forums or forums where the moderation staff does not care about accuracy of information, to sites where accuracy is number one (like this one). You will find that there is an inverse relationship between the collective EXPERIENCE of a site's members, and the TOLERANCE of those members for the posting of incorrect information.

When you find a site where the members understand that growing plants is a SCIENCE, not a matter of opinion, you will find a place where fact is fact, and help is helpful. You've found one here, if you choose to take advantage of it. There are as any styles of growing as there are growers, but %reflectivity numbers are a quantifiable amount and not open to interpretation.