NYT: This week Home Depot fired a new marketing salvo in what is expected to be a broader national effort to get home customers to adopt LED lighting. The Home Depot A 40-watt-equivalent bulb sold online at Home Depot. The retail giant began selling one of the light bulbs in its highly energy-efficient lineup at a surprisingly affordable price of just under $20 online. Bricks-and-mortar stores will follow in September. While $20 hardly sounds like a deal at first blush, such …