Separate Green Led Charge Indicator and Pre-Wired Battery Pack For Ease of Installation. Requires 45Mm Cut Out (Battery Passes Through) 55Mm Overall Dimension. For Maintained and Non Maintained Use. This Unit Can Be Used As A Standard Led Down-Light With Emergency Battery Backup. Operational As A Maintained Or Non Maintained Unit. 210Lm. Ideal for Landlords, HMO Owners, B&B's, Hotels, Pubs, Restaurants, Offices, Schools Separate green led charge indicator and pre-wired battery pack for ease of installation. Requires 45mm cut out (battery passes through) 55mm overall dimension. For maintained and non maintained use. This unit can be used as a standard LED down-light with emergency battery backup. Operational as a maintained or non maintained unit. 140lm. Non-maintained emergency lighting is designed to turn on in the event of a power failure. It is linked into a building's lighting circuitry and reacts when the power fails, ensuring emergency exit routes remain illuminated. This emergency type of lighting is commonly found in the workplace, such as offices and factories, where people are familiar with the escape routes and homes of multiple occupancy and holiday let commercial property