I purchased this several years ago, but the shape didn't suit me, so I've kept it in storage unused. Long-life type, approximately 2000 hours Model number: LB-DL5638W-2PN Product number: 06-4754 Specifications Outer diameter: 55mm, Overall length: 100mm, Weight: 26g Rated power consumption: 38W Rated input current: 0.38A Total luminous flux: 485lm Rated lifespan: 2000 hours Energy consumption efficiency: 12.7 lm/W I purchased this several years ago and have not tested it. Please only purchase if you accept that it has been stored at home.