| More Info - Here are light intensities in footcandles noted from the University of Missouri Extension Service for fluorescent 40 watt tubes - depending upon lumen output of individual bulbs - your results may vary slightly - but will give you the general concept/intensity to expect:
2 tube 2 tube 4 tube
unshielded shielded shielded
1/2ft 500 700 900
1 ft 260 400 600
2 ft 110 180 330
3 ft 60 100
4 ft 40 60 100 |