These Horizon Infinity Reflectors are manufactured using Reflective Specular German Aluminum (95% Reflective), which is highly effective at reflecting almost all light from your bulbs directly onto your your plants.This direct venting of hot air is ideal in situations where CO2 is used. The CO2 stay with your plants where it belongs, not vented out with the hot air from your bulb. The tempered glass face is air tight and is extremely durable and heat resistant. The Horizon Infinity Air Cooled Reflector comes with an industrial 15' lamp cord and socket which is compatible will all size HPS/MH bulbs. The connector is the standard Universal Type. A reflector this large is best used with a 600W or 1000W HPS or MH bulb. A 600W bulb will normally cover between 16 and 25 square feet. 1000W is best in an area between 25 and 36 square feet. High quality construction make this reflector one of the best values in the industry.