Yield Master 2 Classic 6" Air Cooled Hood bulbs Supplementing your preferred nutrient program 3259 Supplementing your preferred nutrient program with Cal Mag™ Plus is strongly recommended when using reverse osmosis water and when growing in coco coir based medias to compensate for natural calcium draw This highly concentrated solution is formulated for use in both the vegetative and flowering stages of growth Completely sealed with double gasketed glass Includes tempered glass built in socket and 15' lamp cord Highly reflective textured aluminum interior for excellent output and uniformity Swing Stop retention cable keeps glass from abruptly swinging down Powder coated galvanized steel housing