BB33UP is a small donut format module with heatsink included. No OEM heatsink is required at 40C ambient. The LEDs are spread out to run cool and provide even illumination in pendants, close-to-ceiling and similar round format luminaires. The module has a 1.25" center cut-out for shaft or key hole clearance and 12” leads for remote driver. If other than Permlight driver is used, contact firstname.lastname@example.org for driver warranty and compatibility.