Objective: Compare venous occlusion rates at a one-year follow-up comparing 1920-nm versus 1470-nm laser treatment. Design: Non-randomized prospective study. Methods: Adult patients with varicose veins associated with great saphenous reflux were included. Procedures were performed between February and April of 2013. The 1470-nm laser ablation was performed in continuous mode, power being set between 8 and 10 W, while for the 1920-nm it was set between 5 and 6 W. Checking for vein closure was performed during the thermal ablation procedure, LEED (linear endovenous energy density) being calculated after the procedure. Follow-up data were collected at the 7-day, 30-day, 3-month, 6-month and 1-year visits, and involved clinical and ultrasound evaluation, measurement of occlusion extent.