Final answer:
Lewis, having purchased an LED flat screen television after they were widely diffused, would most likely be classified as part of the late majority or laggards in the diffusion of innovations theory.
Step-by-step explanation:
The question you've asked relates to the diffusion of innovations theory, which is a concept in sociology and consumer behavior. This theory describes the process by which new products and technologies become adopted by various segments of a population. If Lewis bought his first LED flat screen television after they were already widely diffused, he is most likely to be categorized as a late majority or a laggard. These are the last two groups of people in the five categories of adopters identified by the diffusion of innovations theory: innovators, early adopters, early majority, late majority, and laggards.
The late majority are typically skeptical about innovation and will only adopt it after seeing most others in their society use it. The laggards are the last to adopt an innovation and they tend to have an aversion to change. Based on the information provided, it is more likely that Lewis is part of the late majority, as the term "widely diffused" implies that a significant portion of the population has already adopted the technology.