Neon Mart via Amazon offers the LE 15-watt Waterproof Ceiling Light in Daylight White for $20.99. Coupon code "NAGEDN6L" drops it to $15.99. Plus, Prime members bag free shipping. That's tied with our December mention and the lowest price we could find by $4. It will light a room with up to 129 square feet of space. Deal ends May 20.