illumination patterns:
1: Top half circle
2: Bottom 
3: Left
4: Right

Exprimental parameters:
imaging:
0.4 NA
magnification 40x (20x objective and an extra 2x at the front port of TE300)

camera:
pixel size 6.5um

LEDs:
central wavelength: 530nm
LED spacing: 4mm
distance from array to sample: 69.5mm
illumination NA: ~0.4