Wow! I think the Mrs. and I both said it at the same time. This is about double the growth I have experienced with soil for this type of lettuce. The plants are now around 25-26 days from seed.
I trimmed the tops of the basil to encourage more horizontal growth and to allow the lights to remain at a suitable level for the lettuce (about 2-4 inches from the bulbs).
I think we will begin harvesting the larger lettuce leaves over the next few days and now expect full harvest around the end of the month.