... Heater 1)Multi burning position version, featuring pressure krypton gasfilled and 3-coil support rings. Life time extended to 2000 hours. 2 ... )Clear Or Frosted quartz glass tube. 3)UV-stop Version featuring the use of special quartz glass ... . Feature: Energy Saving, High lumen maintenance, long life, High heat and mechanical resistance Bulb: Straight, U sharp, C sharp, also could ...