Watch this video it will help you with the light.   Bottom line You can only give the plant so much light to what environment and food you give the plant. In other words I can say you need to be at 800ppfd during flowering but I am wrong cause the parameters you set are for 500 ppfd. I hope this video helps you. If there is one thing I can get across to you is don't give up on something because it did not go right for you but take the time to understand why it did not and grow and learn. Mistakes are so valuable in this game! I refuse to give up!  Piss me off I work harder. Mistakes make the man. 

https://youtu.be/ID9rE5JewVg?si=G69zzX8l5Ds-HJgW