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The light will spread over approximately 40cm² per LED, in all they should cover about 280cm², where of course some overlay will occour...here is an interference image I created (the dots have 1cm distance)

If I have a specified number of light sources with known luminous flux and opening angle pointing in the same direction and with known distance from eachother, how can I calculate the total luminous flux? In a specific problem I have a 100 LEDs with 22 candela and a 20° opening angle which I calculated to give me 3300 lumen per lamp. However now I am unsure how much light the combined hundred lamps (aranged in a grid with 1cm distance) will give - as I strongly assume it wont be just 330.000 .