... ceiling lighting 3*14W 1,cold-rolled steel sheets 2,with mirror reflector or matt reflector 3,T5 tri-phosphor tube T5 ceiling ... card buckle type for the reflector. - Or with arc reflection,lighting becomes more centralized,even and bright; - No flickers and better ... .98, THD<15%, Life = 20,000 hours, CE Certified;Normal High Standard Ballast, PF≥0.95, THD<30%, Life = 15,000 ...