Cheap and powerful stroboscope: Turning a floodlight into stroboscope?
Use a $28 Mean Well HLG-40-24B LED driver to power a $4 Bridgelux BXEB-L0280Z-50E1000-C-B3 







The HLG (B type only) has a 10V Dim/PWM wire.  

You can likely find a cheaper Mean Well knock off.
All you need to do is add a 10V signal from your Arduino.