Total radiation measurements for oxygen-enhanced/natural gas diffusion flames are reported here. The parameters that were studied included the oxidizer composition (Omega = 0.25-1.00), the burner firing rate (q(f) = 3-28 kW), the equivalence ratio (phi = 0.55-1.45), and the axial (L(r) = 0.5-6.5) and radial (D-r = 0.4-1.0) position of the radiometer. The measured radiation ranged from 10 to 65 kW m(-2). The nozzle Reynolds numbers ranged from 480 to 10 300. The location of the peak flame radiation ranged from 9 to 15% of the visible flame length. The stability limits and visible flame heights are also reported for a burner with a wide operating range.