We use the calibrated unit radiant efficiency
instead of raw data counts to account for the excitation light projection on to the stage and the nonuniformity of that light projection in order to get a quantitative output.
Low intensity infrared heaters have an average radiant efficiency
from 35 to 55% and high intensity infrared heaters have an efficiency from 55% to 80% (ASHRAE 2008, Systems and Equipment).
Available in both natural or propane gas, the CE-approved ADU/ADL advantage series high efficiency radiant tube heaters have a higher radiant efficiency
rating than comparable heaters for more efficient, comfortable and cost saving heating.
The LTU130 U-Tube heaters, rated at up to 130,000 btu/hour each, are said to incorporate features not found on most competitive units, including a self-contained draft inducer, which pulls the products of combustion through the combustion chamber for increased radiant efficiency
The heaters' high emissivity ensures radiant efficiency
in a range of applications, including plastics, coatings, thermoforming and OEM oven construction.
The ETU200 Space-Ray tube heater features a self-contained draft inducer, which pulls products of combustion through the combustion chamber for increased radiant efficiency