Lower panels: (left) coverage of the MegaCam filters with SnDICE (2008). The central wavelengths of all LEDs are displayed with arrows. The shaded regions show the wavelength extension of each LED SED – within 7% of the spectrum peak. In 2007, no narrow spectrum LED with sufficiently high power was available around 700-nm and above 900-nm. Right: coverage of the SkyMapper filters with SkyDICE (2010). The position of about half of the LEDs were chosen so that they constrain the filter cutoffs well. The other LEDs were selected to fill the gaps between filter cutoffs with about one LED every 20/30-nm. Upper panels: (right) sampling from the near-UV to the near-IR achievable with the LEDs listed in the OSRAM and Roithner catalogs. Left: optimised sampling of the MegaCam passbands that can be implemented today with the LEDs available on the market.
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