Description: Sylvania 69512 SOX55 Low Pressure Sodium Light Bulb 55W low pressure sodium lamp, BY22D base, T17 bulb, open fixture rated, base up operation, clear, 1700K ANSI Code - L71 ANSI Code 2 - L71 Approx. Lumens (initial - horizontal) - 7800 Approx. Lumens (initial - vertical) 6735 Approx. Lumens (mean - horizontal) - 6735 Average Rated Life - Vertical (hr) - 18000 Base - BY22D Bulb - T17 Color Temperature/CCT (K) - 1700 Diameter (in) - 2.126 Diameter (mm) - 54.00 Family Brand Name - SOX Low Pressure Sodium Fixture Requirement - E Hot Restrike Time (min) - 2-4 Lamp Finish - Clear Maximum Base Temperature - Fahrenheit - 302 Maximum Base Temperature - Celsius - 150 Maximum Bulb Temperature - Fahrenheit - 302 Maximum Bulb Temperature - Celsius - 150 Maximum Overall Length - MOL (in) - 16.75 Maximum Overall Length - MOL (mm) - 425 Nominal Voltage (V) - 109.00 Nominal Wattage (W) - 55.00 Operating Position - Base up +/- 110deg Warm-up Time (min) - 7-15