Lettuce is one of the most consumed olive species in the diet, its cultivation is generally carried out in a conventional system, protection horticulture such as hydroponics allows to improve its vegetative adaptation and yield; the main objective was to determine the effect of sunlight intensity on the 3 types of varieties of Lactuca sativa. The nursery was made on a moistened sheet of paper towel, then after 5 days each seedling was placed in a sponge cube accommodated in a Styrofoam float fed in a source of nutrient solution, after 10 days they were transplanted to the 3” PVC tubes distributed at 1.0 m above the ground, each tube was fed with a circular flow sheet of nutrients, until harvest at 35 days. To evaluate the behavior and characteristics of the 3 lettuce varieties, there is a significant effect (p<0.01) between varieties for height, plant width, stem diameter, root length,...