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40 watts power in
Ballast 90%
Electrodes 92%
Discharge 85%
Phosphor 86%
Quantum efficiency 45%
11 w
Visible lightout
4 w Ballast loss
3 w Electrode loss
5 w Not visible or UV
4 w UV photons lost
13 w Quantum efficiency5.5 ev UV to 2.5 ev visible
Losses in a 36 w t8 tri-phosphor fluorescent lamp with electronic ballast