Observer frame light curves for a SN Ia (upper panels), SN IIn (middle panels) and SN IIL (lower panels) in the HAWK-I J, HST F125W and WFIRST H bands, respectively. The horizontal dashed lines indicate the depths assumed in the calculation, 24.5 for the J band and 26.15 for F125W. In the H band the three depths represent the three main survey modes planned for WFIRST (Spergel et al. 2013). The yellow band denotes the average magnification from the galaxy cluster A 1689 at the same redshifts in the central region with 2.7′ × 3.3′.