... 4.weight:450g 5.Charge-Discharge Cycle:>=500times ApplicationKL4LM mining lamp is suitable to coal mine well with explosive gas ... reliable,volum small,weight light,illumination time long,illuminance strong,life long,anti-corrosion,maintance free,use- cost low ;2 ... Safety Performance Requirement of Mining Lamp: GB9757-20032, KL Type Mining Lamp: MT927-20043,KL4LM Type Mining Lamp:Q/DG.018-2007 ...