LED Luminaire for Exit Sign The BZD310 series Exit Signs are illuminated by LEDs, providing the customer with long-life, low maintenance, and dependability for use in conditions where reliability is crucial. Designed for the most severe environments, the BZD310 LED Exit Signs will provide maximum performance against rain, moisture, cold, corrosion, and dust in applications such as refineries, and petrochemical and chemical plants. Explosive gas atmosphere: Zone 1 and Zone 2; Combustible dust environment: Zone 20, Zone 21, and Zone 22; Explosive gas atmosphere of IIA, IIB; T1-6; 24-hour charge and recharge recovery time increases safety; ● Brown-out protection protects battery and reduces labor; ● Heavy duty Ni-MH battery for long life meets 90 minute requirements for battery operated emergency system;