Example of a simulated UV/Optical AGN spectrum (solid blue line, left) along with a Sa-type host-galaxy template (solid red line). The transmission curves of the LSST broadband filters are shown with solid black lines (ugrizy; from left to right). In this particular case, the host galaxy contributes about 50% of the total flux at 5100 Å (rest frame). Flux-calibrated light curves resulting from the convolution between each LSST broadband filter with the AGN and galaxy components (right).