With regard to this specific question, I found the following thread EXTREMELY helpful:
http://www.beardeddragon.org/forums/viewtopic.php?f=34&t=98349&p=764473&hilit=Megaray+200#p764473
Perhaps the OP may find it helpful as well.
As to where to get the best information on beardies? This site has saved our beardie, when the published book we had (while helpful), could not. Nevermind just about everything the pet store provided, both in supplies and information. The book we have on beardies, it's only a couple of years old, and it did/does provide decent GENERAL information on set-up, and health and care. The feeding information, particularly with regard to young beardies, was WAY off (an example of a young beardies feeding schedule for instance, stated 6 or 7 bugs a day), which bd.org here helped me to understand. Also, a book cannot provide information on BRANDS, and I believe in the beardie world, brand of supplies (particularly UVB bulbs), is absolutely crucial. We were using an UVB from the start, but not one that could provide what our beardie needed. But I digress... for me, it's been about using a number of different resources, and looking to bd him/herself as to what was giving him/her a better quality of life. There is certainly information available in books, and on the internet which is unhelpful, inaccurate, just plain wrong, even perhaps, dangerous. Personally, I have not found that to be the case on bd.org.
Just my .02 for whatever that's worth. :dontknow:
The best,
Em