If the absorption characteristics of the target material are known, it may be possible to use peak emission wavelength as a means of choosing the most suitable emitter. If those characteristics aren’t known, small scale testing with 1 or 2 emitters may be enough to provide a better understanding of what works with the material in question. Another key factor is the thermal response time required by the process. Ceramic emitters typically require about 10-12 minutes to reach steady-state temperature. Quartz cassette emitters require about half this time, with tungsten/halogen emitters close to full output within a few seconds.