The EXP-EMG-12W-2L Explosion Proof Emergency Light with back up emergency battery from Magnalight is rated Class 1 Division 1 Class II Division I & II.
This product will ensure the most effective and reliable safety lighting options available. Along with 90 minutes of back-up battery life in times of power failure, this new low-maintenance model was made to last 10 years. This lamp contains two 6 watt LED lamps, and a high-temperature Nickel-Cadmium rechargeable battery for powering the lights in an emergency. This battery is protected from deep discharge by solid state circuitry which senses low voltage and turns off the unit before battery damage can occur.
Moreover, this lamp can withstand temperature variances ranging from 0° to 40°C, and the LED lamps within are "exceptionally long lived and highly resistant" to shocks, impacts and vibrations.
And to finish, an integrated pilot light indicates the presence of AC current and a test switch allows easy confirmation of proper emergency operation.
But as you already know, new technology and security have a price, and here you have to spend $3,945.00 for each.