Koomey, J.G.; Sanstad, A.H.; Shown, L.J. - 2009
economic characteristics of standard and energy-efficient magnetic ballasts for fluorescent lighting. Efficient magnetic … ballasts represented an excellent investment for 99% of the commercial building floor stock, and a moderately good investment … for 0.7% of the commercial floor stock. Still, these ballasts were only being adopted in the 1980s at a rate commensurate …