stef35 wrote:thanks for your replies, guys
to be more specific, i would like to use a pack of 4*50W lights, to trigger flash lights as you could see in band concert.
at the moment, i have tried with RF power socket but there is too much latency between switch on/off.
I guess i would dhave the same behaviour with relay, as it is not their purpose to be switched on/off very quickly.
I was said triac could do the job, but i do not know how to wire it to the raspeberry and how to trigger it.
Stage strobes have changed a bit since I were a lad. Used to be you hit the button, the strobe flashed. Now stage lighting is all DMX and it dosent have the speed for rapid flashing. If you want a single synchronous pulse then the lighting desk send a single flash command, latency is quite high but within gig allowances, lets face it if you are at the back of the hall then the sound is many milliseconds late anyway. For higher flash rates then the desk sends a speed signal and the strobe does the rest.
The strobe tubes have 3 connections, 0V, power and trigger, you put many kV across the power and 0V then a small (10s of V) signal on the trigger will cause the flash. For strobes that arent required to flash frequently a charge pump charges a capacitor to the many kV. For strobes that need to flash more rapidly the the HT PSU is a whole different ball game.
Incandescent lamps never really cut it as a strobe and LEDs dont really have the power.