High Pressure Sodium HID Bulb, Bulb Base Type Medium Screw (E26), Bulb Dia. 2 1/8 in, Bulb Shape ED17, Color Rendering Index 22, Color Temperature 1900K, Lumens 3,800 lm, Light Technology High Pressure Sodium, Overall Length 5 1/2 in, Shatter-Resistant No, Watts 50 W, Bulb Finish Frosted, Rated Life 24,000 hr, ANSI Code S68, Dimmable No, For Enclosed Fixtures Yes, Bulb Operating Position Universal Burning, Standards Meets 2012 Lighting Legislation Energy, TCLP Compliant, Trade Number LU50/D/MED