The BLACK-Comet concave grating spectrometers and the Dual-DSR spectrometer configurations are the perfect tools for making solar irradiance measurements. The solar irradiance monitors are great for solar simulators and artificial lighting of all kinds. The instruments are calibrated to measure the spectral irradiance in units of watts per meter squared over the wavelength range in nanometers. Currently there are four model BLACK-Comet irradiance monitors, C (190-850nm), CXR (280-900nm), C-SR (200-1080nm), CXR-SR (220-1100nm). The Dual-DSR Solar configuration enables irradiance measurements from 200-1700nm.