GKI/Bethlehem Lighting excels in making quality Christmas lights! Long-lasting brilliance! Each lamp shines with rich color and remarkable intensity for more than 3000 hours! Plus, the string stays lit if one bulb goes out. GKI/Bethlehem Lighting uses 200mA lamps to ensure the greatest possible brightness. Steadfast reliability! The GKI/Bethlehem Lighting patented external lamp lock prevents loose connections--the most common flaw of light set failure. Locked in their sockets, lamps will not come loose. Twist-Proof lamps provide added security and eliminate misaligned wire contacts. Safety Certified--Lights are UL listed. GKI/Bethlehem Miniature Light Sets are guaranteed to light for 3 years from date of purchase or 3000 hours of use, which ever comes first.