I have a 10g nano anemone tank. I ran a kessil a160 tuna blue (40w) over it. The BT anemone would sit at the top of the rock and would strain to reach light; they get a trumpet shape or stretch their base to do so. I switched to a Radion xr15 and no longer have that problem.
Your light is 30w and has a less dense LED array (concentration of light). This is not a light I would recommend for lighting your anemone. Xenia, zoas, etc would be fine.
Anemones can be given food to supplement a lack of light and I would recommend you do so. Be careful as this will cause nutrient issues.
Ramping of lights is actually a newer thing (last 8 years or so). Previously we ran bulbs that flipped on and off. It’s not an issue.