The history of surgical lighting includes the use of candles, natural light, filament bulbs, halogen bulbs, and LED lights. Early surgical lighting involved: •Candles: Used before electricity was discovered in 1879. •Natural light: Surgeries were performed during the day to take advantage of sunlight. •Windows: Early surgical lights used windows facing southeast to maximize sunlight. •Mirrors: Used to reflect light and maximize sunlight exposure. Later surgical lighting involved: •Filament bulbs: Used in the early 1900s •Halogen bulbs: Used in the late 20th century •LED lights: Introduced in 2005, LED lights are more energy efficient, have a longer lifespan, and produce a more uniform light than traditional lamps According to Kaye, surgical lighting should fulfil the following essential requirements: •Lighting must be centred on the surgeon's immediate field. •Lighting must illuminate a wide and narrow field with a high intensity light. •Lighting must be able to penetrate a cavity or under a flap. •The light source must be cool. •Lighting must not impede with the surgeon's mobility. Consideration for these requirements has led to four main types of surgical lighting in modern surgery: OR headlights, headlights, lighted retractors and operating microscopes. This poster explores the historical timeline of surgical lighting and surgical lighting systems of the future. (1)Kaye BL. An improved quartz-halogen headlight. Plast Reconstr Surg. 1976. 57(1):110-111. doi:10.1097/00006534-197601000-00028 (2)Sharma N, Heer A, Su L. A timeline of surgical lighting - Is automated lighting the future?. Surgeon. 2023. 21(6):369-374. doi:10.1016/j.surge.2023.05.004