An effective way to reduce heat in the garden and to allow closer light positioning over the plant canopy, they can also aid in stabilising microclimate as passing air is not dried as quickly over the plant canopy. Handy Tips. In extremely hot environments 2X 1000W lights will require approximately 800cfm of air through the reflectors and the use of ducting splitters is recommended if you're looking to archive even cool temperatures and lamp life over all cool tube fixtures. Strong clip on lens 150mm outlets White powdercoated casing 550mm (L) x 375mm (W) x 187mm (H) High polished 2 sided specular aluminium reflector accepts 400, 600 & 1000 watt HPS and MH Lamps