Determining the "strongest" between Luke Skywalker and DC Lanterns is challenging, as they possess different types of power.
Luke is a powerful Force user with exceptional lightsaber skills, while DC Lanterns, like Green Lanterns, derive their strength from the emotional spectrum and wield immensely versatile power rings. The Lanterns' abilities are vast, limited only by their imagination and willpower, making them formidable. However, the outcome would depend on specific circumstances, the Lantern in question, and the narrative context, making a direct comparison difficult.