... Factor≥0.85Lighting wayDirectly lightingLife Span 50,000 hrs Operation Temperature-20°C ~ +45°CStorage Temperature-25°C ... as conventional grille light, direct replacements4. Our Ceiling Lights, No hazard of mercury, No infrared rays, no ... no humming, no RF interference.13. Ceiling Lights, Installation: recessed, mounted, suspendedCeiling Lights Application· Office lighting: conference rooms, showrooms ...