A perfect complement to the OptiClimate range of water-cooling systems is the OptiClimate Hygrostat With Light Cell. The light cell and moisture meter automatically control the dehumidification function with the light sensor determining whether it runs on the day or the night setting. The built-in light cell is supplied already connected with the unit and it should be hung uncovered in the growing space. OptiClimate water cooled systems are fast becoming the growers' choice to optimise plant health and productivity by providing beneficial growing conditions. They work by automatically establishing and maintaining growing room temperatures - effectively cooling, heating, dehumidifying, filtering and circulating air as needed. To increase the efficiency and reduce the need to manually activate the night and day settings of your OptiClimate system, we recommend adding this to your setup.