The emitted radiation preferably has a spectral radiant power distribution, for which the maximum is at {HEAD ~ a wavelength} in {TAIL ~ the infrared range} 
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The emitted radiation preferably has a spectral radiant power distribution , for which the maximum is at { HEAD ~ a wavelength } in { TAIL ~ the infrared range }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL