60% by HPS). This is an advantage when high temperatures force the controller to dim your lighting: though your crop will get less light, the quality of your light actually improves. You can also use this feature to dim your HPS lights in veg while maintaining full plasma light output, improving the spectrum for the vegetative crop. Suitable for 120 - 240 Volt. Prewired with 120 V 16 ft cord with NEMA 5-15 plug.