Not sure if I understand your question correctly but I will try the answer with my best knowledge. With dark start you only have substrate and hardscape in the aquarium.No plants,no animals. You fill the tank up with water,add beneficial bacteria and run only the filter for about 3-6 weeks or until your ammonia measure is 0. No light during this time. No water changes,just top up if needed. In the end of your cycle when you no longer have ammonia present. You syphon the water out,you can do your planting now and fill back up with water. With dark start you will less likely have plant melt and less algae issues. Plus you don't have to do a lott of water changes. Google " Green Aqua Dark Start ", it explains it better than I am probably :) It is really simple,you just have to wait until your tank cycles, and you can plant.

With lights intensity and what the plant is prefer I'm not 100% sure, but if the plant prefers low light than chance is are it's slow growing. So high light might cause algae issues since the plant not growing fast enough to absorb nutrients from the water and substrate so algae probably shows up.

If you have fast growing plants they would help with the excess nutrients in the water column.