Our platform lighting solution, developed with our partners Europa PLC and installed by Taylor Technology Systems, meters energy usage on each individual lighting circuit. The lighting is controlled by photocells and override switches in the usual way but our solution offers the following advantages over conventional control systems:

• Sometimes there is a particular photocell which is well placed for sensing ambient light conditions across several platforms. This photocell can be used to control the lights on all those platforms. This is done with a simple mapping of lighting zones to photocells.

• Photocells sometimes fail and they generally fail off, leaving passengers and staff at risk of sudden unexpected loss of safety lighting. Based on our lighting by default design, we can schedule lights to be on during the hours of darkness so that, if a photocell fails at night, the lights it controls stay on. Our control hub can sense whereabouts on the network it is using GPS and use this to calculate sunrise and sunset times at its installed location through the year.

• Photcells can also dither (switch back and forth between on and off) around dawn and dusk, Lighting by default keeps lights on for 15 minutes once they have been turned on by the photocell to avoid dithering.

• We use normally-closed contactors to control all lighting circuits. This means that, if for whatever reason the contactor loses power or fails, it will fail in the "lights on" state.