In my experience, reducing the light intensity or illumination period has never been very successful for me at eliminating any algae issue (it just slows it down a bit)
the exception was Cyno in which 3 or 4 days with lights out and tank covered by a thick blanket so no light penetrated did remove all the Cyno and my tank of softies and fish seemed no worse for the experience - followed that by increasing flow / adding power heads or re positioning existing ones I had to improve flow in tank (Cyno appreciates calm water as do other algae species )
removing the nutrients that are fueling these algae is my preferred 1st course of action along with physical removal of as much as I could at water change times ( make the removed water in the bucket as green/ dirty as possible being my aim at said water changes)
Chemical means as a follow up option should the nutrient reducing fail to achieve what I wanted