PPE: 2.5 µmol/J Diodes: Samsung lm301B Coverage: Flower Coverage: 2′X2′, Veg Coverage: 3′X3′ Grow Tent Compatible: 2'X2' Recommended Fan Size: 4-Inch The SF1000D is the most basic LED grow light offered by Spider Farmer. It does not have a dimming function, so the only way to adjust it is by changing its height to suit the various growth stages of plants. If you require a grow light with dimming capabilities, the SF1000 is the best alternative to the SF1000D.