Corn cobs are a fantastic way to take advantage of LED technology without having to install a brand new fixture. The difference between Passively Cooled and Actively Cooled Cobs, are that these are built with a solid metal heat sink frame without the need for an active fan cooling system. Passively cooled cobs have larger physical dimensions compared to actively cooled and are designed for larger existing light housings. Perfect for use in existing wallpacks, area lighting, garage lights, and much more. Available in 20- 250 Watts.