ecoBright LED Corn Bulb 54W (5000K 8100LM E39/E40 Mogul), 350W Replacement, street lighthing, area lighting. At least 15% more efficient than competition bulbs. When comparing our product compare lumens. Not only watts. Top quality product. Highest grade aluminium with outstanding thermal conductivity. 150 Lumens per watt - the highest efficiency in the USA. Suitable for use in enclosed fixtures. Running temperature is lower than competitor brands = longer bulb life. Samsung SMD 5630 highest quality and most efficient LED Chips.