Both fixtures will take LED light bulbs Edition base for brighter cooler light. 1. Mini Recessed Fixture uses either LED or incandescent 75W max. medium base reflector type bulb. Diameter of bulb to be approx 31/2". For non-insulated ceiling. 2. LITELINE 4" recessed lighting combo fixture NEW in box instructions included. Light bulb is Edison base. For use in finished ceilings and T-Bar ceilings.