Here is the lettuce specimens that have been growing under blue-only LED's for 20 days now. At this point I think it's safe to conclusively say that these plants are by no means thriving. Under normal light, the plants have a very normal and uniform green appearance (no necrosis or browning/yellowing of leaves), but they have very slender, weak stems which are unable to support the weight of their tiny leaves.
Root development is also severely stunted (not shown in this photo). Each of these plants has 2 to 4 thin, wispy roots and do not appear to be developing further root structure.
For those wondering, the wavelength of these blue LED's is in the 460 to 470 nanometer range.
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