The Hackney Light Clock offers a contrast to the environmental light of Leighton Moss. Like the Leighton Moss Clock, this measures time according to the changing luminosity and colour of the sky over the day and night and throughout the year, this time in East London. The increased levels of artificial light in this dense urban area can clearly be seen. The phases of the moon, very clearly visible in the the Leighton Moss Light Clock are also masked.