Conflicting info is not hard to come by, that's for sure.
With all the reading I've done I most often saw the hundreds of thousands of ova numbers cited rather than the thousands.
I link that article because I thought it was pretty clear and the easiest for layfolk to read....tho I still wonder how the supplemental light might effect molting.
Since you're a reader, I thought you might enjoy this enlightening article
http://www2.ca.uky.edu/poultryprofi.../Chapter3_Anatomy_and_Physiology/Chapter3.pdf