I have no experience of that light. You can put electrical tape over some of the leds.Yea im starting to realise that light purchase may have been a bad idea I Only have lights on now for 6hrs now, I wish it had a dimmer. I might change the metal rods as you suggested. I had seen a twin star light that looked decent but it’s just the cost. That’s the problem with this hobby.
edit - I had also thought of a cover for the light as it blinds the room it is in. A 3D printed one was the idea I had. Something similar to 2nd pic
I like a light not to sit right above the water level. Just a personal preference.