... .long lifespan,prompt delivery 4.expert in OEM service Specifications: 4U Energy Saving LampName: USH-HST4-25WVolt (V): 100-130, 220-240Watt (W ... . Environmentally friendly, using own designed electronic ballast to make high efficient energy saving.3. Long life, through thousands of tests, we make a ... life7.Competitive Price. Delivery on time. Good after-sale service 4U energy saving lamp 2013