(6 Pack) Verilux 36W Natural Spectrum Replacement Compact Bulb - Verilux CFML36VLX 6 Pack Clean, bright Natural Spectrum daylight provides greater contrast and true color rendering from trucolite phosphor technology Longer lasting and extremely energy efficient The bulb would fit only Verilux Happy Lights (VT03JJ1, VT05WW1, VT20WW1, VT15WW1)