All 40W NuOptic illuminators require 24V AC ± 10%, 1.3 A or 24V-36V DC, 1.7-1.2 A.  All 80W NuOptic illuminators require 24V AC ± 10%, 2.5 A or 24V-36V DC, 3.3-2.3 A. For convenience, NuOptic offers 36 VDC power supplies ranging in size to power a single 40W illuminator up to our most powerful triple ganged 240W illuminator. Although we recommend using 36 VDC due to a slight improvement in efficiency and cable run lengths, any voltage within the range listed will reliably power a NuOptic illuminator. Be sure that the power supply you use is sized to provide the necessary current required by the specific illuminator model.