Yepp, you can set a limit! The left poti is the voltage limiter. Set the voltage to 24v using the multimeter from the last picture. This 24v will be divided by 8 diodes in series, so the maximum one diode can get is 3v. A LM561c needs 3,05v at 200mA/50°C, this means, if the voltage is limited to 3v the maximum one diode can get is only around 190mA or 5% below it's maximum rating. Set 24vdc as max. voltage and you can be sure you run the strips not too high even if the current poti on the right side is set to 100%. Set the voltage limit to 23,5v and and the diodes are further limited and can just get only ~150mA max.