Thanks for the link Hoppy but I nearly had a heart attack seeing the maths involved :O
I will switch to 60 degree optics. I am considering 21 or 24 LEDs also instead since I will be able to dim them anyway. Anyy suggestions on if it will be overkill ?
Ideally I am currently and plan on continuing to run my tank at medium light but would like the flexibility to go from high to low and Im guessing this functionality would be provided by the dimmable driver. Im just wondering how many LEDs would suit this for my size tank.
Could you help me out with the calculations in the link you provided Hoppy ?