Sure any light can grow algae, but you also need the nutrients in your system to feed that growth.
LOTS of setups run actinics 12 hours a day with no hair algae growth problems.
Heck im not running actinics and I have hair algae, and when I did run actinics I had zero hair algae, so what does that tell ya? That nutrients are the problem, not the actinics.
And the actinics don't contribute much light compred to main lights usually, so cutting back on main lighting from say 10 down to 8 hours would probably have a much bigger impact that limiting actinics.
Although actinics main function is usually visual appeal, they also greatly impact coralline algae growth IME, when running actinics my coralline was probably 5 times more prolific than it is now, so they do have use other than visual appeal.
I would put your actinics on a timer though, for ease of use.
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