Savvypixel Direct via Amazon offers the Savvypixel 7-watt Dusk to Dawn Light Bulb 2-Pack in Cold White for $18.99. Coupon code "WJ84TYIU" cuts it to $10.79. Plus, Prime members bag free shipping. That's $12 off and the lowest price we could find. It features automatic on/off and 630 lumens. Deal ends November 30.