OptiClimate 3500 Air-Cooled SystemWant maximum and consistent yields all year round? Get an OptiClimate 3500 Split Air Conditioning System. You can create and maintain the ideal temperature, humidity and CO2 level for optimum growth. You can synchronise it with CO2 equipment and up to 6 x 600W lights or 9 x 400W lights via a Dimlux Maxi Controller. It's easy to use, with separate settings for night and day. To prevent bud rot (botrytis) and shock, plants are slowly eased into each