Sub-Zero™ | Active Battery Thermal Support | 8W | IP20

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  • Can extend the lower operating temperature of an emergency

    luminaire down as low as -20°C

  • Maintains safe battery temperature in outdoor applications
  • Negligible effect on existing maximum battery temperature
  • Available in various battery formats**
  • Built-in data logging of under and over-temperature events
  • Extended battery warranty of 4 years*
  • Compact controller allows retrofit upgrade for existing


  • Proportional heating control system with maximum 6W


  • Minimal standby consumption when the battery is over 25°C
  • 12V SELV isolated heater control
  • Simple plug-in battery heater connection
  • Push-wire mains terminals for solid or stranded conductors up to
  • 1.5mm2
  • Complies with: EN55015, EN61000-3-2 & EN61547
  • * Battery warranty valid when products are operated and
  • maintained strictly within
  • specification. Contact One-LUX for further details


Product Description

Sub-ZeroTM is an emergency lighting battery solution for low

temperature applications.

The system comprises a mains-powered control unit that operates

alongside the normal emergency control gear to provide low

temperature support when needed. It is for batteries of many

traditional formats, so making them suitable for retrofitting or

upgrading existing luminaires.

The system is the UK designed and built and comprises a compact

microprocessor-based controller, which constantly monitors the

the temperature within a specially configured battery pack and maintains

the battery’s temperature within safe levels. If however the battery’s

the temperature rises above 25°C then no heating is applied and the

the system is on standby.