I just had a look at the instructions for the Dual Ramp Timer. At the top of page 4 under the fixture compatibility heading it includes "Most 12-24VDC LED fixtures not exceeding 120 watts (@24V) with a compatible DC barrel jack connector"
This means all of the LEDs you intend to hook up to it should work fine, the Timer will modulate the output accordingly. Both input & output for the Timer are listed as 12-24VDC. Provided the power supply you hook up to the Timer has sufficient wattage to run your lights it can be anywhere from 12-24 volts. At the moment your LED wattage adds up to roughly 20, so go shopping for any 12-24 volt power supply that can provide at least 30 watts. It's always better to have a little more headroom rather than run a power supply at its maximum rated output and the price difference isn't that much. An oversized power supply will run much cooler.
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