1. *20% OFF Hinkley Lighting + Free Shipping from Lumens. Coupon Code: HINKLEY. Price: Not Specified. Discount: 20%. Categories: Lighting. Coupon Rating: 4.2 Stars out of 5. Store Rating: 4.5 Stars out of 5. Coupon Recommendation: Recommended. Available Until: Not Specified. Thoughts: None.