Something you may want to keep in mind is the harvest timing referred to on seed packages is in reference to traditional soil grown, outdoors gardening under natural sun.
Hydroponic farmers have found that it's much more efficient to grow for only 4 to five weeks on lettuce crops to maximize annual harvest weights. That allows for more crops per/year and radically increases the annual yields by weight.
You would be much better off growing for only 4 to 5 weeks under 20 hour lighting than trying to grow for the time span set for full grow soil gardening.
Just plant more head, more often. The rows can be spaced tighter as well.
The *young* lettuce is also more tender and more of each leaf can be used without the pith or woodiness of end leaf full sized soil plants.
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