Dr. A. J. Both of Rutgers University used model SPEC PAR/NIR to examine the output of several LED lamps and traditional lamps and evaluated their usefulness for greenhouse and growth chamber applications.

In the graph at right, these lamps are compared to the solar spectrum and the Relative Quantum Efficiency (RQE).  Below, he compared a warm white lamp and warm white LED, click for larger views.
 

 
In the table below, Spectral Efficiency is a way of comparing the lamp’s output to the RQE.
 

Common  Lamps	Spectral Efficiency*	LED   Lamps	Spectral Efficiency
HPS	0.89	Super Blue	0.72
MH	0.78	Super Red	0.98
INC	0.49	Cool White	0.80
FCW /     FWW	0.86 /      0.87	Warm White	0.82
SUN	0.64	Plant Bar	0.92

    * Bugbee, 1994:
    PPF Correction Factor =
    [(PF)_i * (RQE)_i]_360-760 / (PAR)_400-700