You need to select a columned LED to test a sun spotter for

You need to select a columned LED to test a sun spotter for an solar system. The sensor is .42cm in diameter, and needs a Minimum input flux of 95 mW/cm2. The sensor will be 15cm away from the LED and the max angel it will read is 25 degs. Will either of these LED\'s work?: An LED with a half diverging angle of 10deg, a clear aperture diameter of 11mm and out put power of 2000W? An LED with a half diverging angle of deg 6.8, a clear aperture diameter of 11mm and out put power of 600W? An LED with a half diverging angle of deg 3.4, a clear aperture diameter of 11mm and out put power of 280W?

Solution

An LED with a half diverging angle of 10deg, a clear aperture diameter of 11mm and out put power of 2000W

because it gives the maximum angle through which the light can been seen