Let me clear up some confusion. From your discussion it sounds like your are creating an all-in-one lighting and EFX controller.

In the world of lighting there is a hard and fast rule that you shouldn't attach an inductive load to an SCR. This is only true if you are using the SCR to dim the attached load. However Melanie is correct in that if you are only turning the load on/off the above rule about inductive loads doesn't apply.

The other thing you need to be aware of is an SCR needs a certain amount of current flowing through it to remain in each state (on/off). So if the strobe isn't working reliably try attaching a light bulb to the output. If things suddenly start working then there wasn't enough current to keep the SCR on, and you will need to switch to a relay.

Hope this helps, you are real close it's easy for frustration to sabotage a project…been there myself recently.