in the past Ive grown > 15 different types of butter head lettuce.  some interesting ones require the seed to be on top of the soil as light activates it.   it requires misting etc.   In NE it get hot and humid and the lettuce is prone to bolting   I discovered shade cloth:   http://www.gemplers.com/shade-cloth   I love this store.  consider their catalog.  50 % shade cloth, with an AM and after noon watering prevented bolting in my area  :
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