... for high quality aluminum,the surface smooth,flat;2. Reflector imported high-purity aluminum reflective mateial,high effciency, ... aging.5. Pole material with ss400/q235 quality steel,hot dip galvanized anti-rust treatment. ... stroboflash and Light Pollution: Because of its high operating frequency, there is no stroboscopic effect, ... recession problem by multiple turn-ons compared to electroded lamps.