CUSTOMIZED DIMMING DESIGN: Upgraded F1000 series growing lights have a dimming knob and light switch so that each light can adjust the light intensity freely. Dimming lighting design and adjustable pulley hanging systems are especially beneficial for small size indoor growing and individual planting. Higher Photon Efficacy: F1000 adopts the latest high-quality LEDs technology-SAMSUNG LM301B diodes, Offering a high efficacy rating of PPF per Joule (2.7 mol/J @ 110V AC), it pulls an actual 100 watts from the wall, to achieve better or comparable results than 200 watts HID with 50% less heat and power consumption. Working Quietly, Reliable And Worth The Money: No fans, No noise. Our 1000 WATT LED Grow Lamp is passively cooled by using a thick 3 mm aluminum heat sink. We use self-made drivers and high-quality LEDs, we made premium heavy-duty and solid construction with LEDs protected by glue coating (Rating: IP65), which will make you worthy every penny you cost. Id