I haven't posted an update on my little experiment in quite a while due to real life intervening. This post is not that update, only a promise that I will make the results available soon.
I've been taking daily pictures of five lettuce plants (black-seeded Simpson, a common green leaf type). Things did not go smoothly, so I have plenty of examples of common problems to discuss. Unfortunately the set of images is quite large and I'm concerned about making an enormously huge post. I'll probably use photobucket or another image host for storage and work up a simple web page to serve the results, with commentary posted here and crosslinked to image gallery pages.
Thanks for your patience.