If you're on a budget, the 1212s will get it done and done well. Visually comparing the brightness of the 1212s at 50W versus 1825s at 70W, they seem to be very close, but with a bit more heat being produced by the 1212s.
But 1825 will give a bit of increased light output and will also fit on Arctic Alpine 11 Plus heatsinks so one could build a 100W+ 1825 light engine for less than 100 dollars.
But 1825 will give a bit of increased light output and will also fit on Arctic Alpine 11 Plus heatsinks so one could build a 100W+ 1825 light engine for less than 100 dollars.