I have the LM631. I've not used it alot, however like the lower ranges for LED readings. I use some of WaveTek's equipment at work and like it, that's one of the reasons I went with the LM (as well as the positive comments I received from some of the talented modders here on the CPF).
20k LUX being the max on the LM...I don't have a need to go over that! As was quoted to me in an email or an earlier post in reference to light meters (do a search)...if you need to go over 20k back up and do the math.
The stated accuracy on the back of my LM package is 3%. The stated accuracy on the link to the Tenma is +/- 5% (+ 2 digits).
Here's a link to
Circuit Specialists LM631 They still have the LM on sale for $85 + a free $30 DMM. I think when I bought mine, anything over $50 was free shipping, so it was the best deal for me!