Lumatek digital dimmable ballast 400w. Lumatek digital ballasts are the most advanced lighting solution for modern horticulture. Small, compact and completely silent these E-Ballasts are able to deliver more lumens while using less electricity than standard magnetic ballasts. Unlike traditional ‘core and coil’ magnetic ballasts, Lumateks are microprocessor-controlled and able to evaluate and compensate for the actual state of lamp degradation and voltage fluctuations in power supply from your ocal grid. This means that Lumateks are able to provide a precise controlled output voltage to the lamp ensuring optimum PAR levels are achieved.Key Specifications/Special Features: Electronic ballast for 250W or 400W HPS or MH lamp Voltage: 230V 50/60Hz Current: 1.80A Input power: 415W Output power: 400W Power factor: >0.99 Voltage range: 165~265V THD: <8% Lamp CCF: <1.7 Operating Frequency: high frequency No audible noise, no flicker Env. temp.: -25~50°C(-13~122°F) Enclosure temp. rise ((?t) 29°C (84.2°F) Env.IP require: >IP23 To light a 400W lamp; set control to 400W and boost output by 10% by switching to 400SL or dim down to 250SL or 250W.