Thanks, everyone! I was waiting for the new light to arrive before I posted pics, and it finally arrived today!
Here is a "before" pic right after I finished setting it up with the old light (10 watt CFL 6500K in a hood), no betta, no background, and newly-planted sad, little plants (April 26):
Here is an "after" pic with Finnex Stingray Cliplight, black background, betta (Patrick), a ramshorn snail, and happier plants (April 30):
The Anubias isn't very happy about all the light. The CFL in a hood was sitting directly on the glass, but now the cliplight is about 3-4" above the glass so hopefully that'll help the anubias without slowing down the other plants too much.
I put a piece of black paper over the anubias for now to shield it. I think I'm going to have to take it out, though, which will be a shame because Patrick likes to sit on its big leaves.
What other plant with big leaves that doesn't mind more light could I switch the anubias for?