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Pretty sure low emissivity describes coatings which alter the behavior of glass in terms of giving off heat by radiation. Specially-selective better describes coatings that affect the behavior of glass relative to radiation that is incident upon it. I know some sources treat these as the same, but I am not sure that's right. Does anybody have good sources on this? Adabhael^Talk 02:49, 19 December 2022 (UTC)[reply]

Specially selective refers to the infrared wavelength that the LowE coatings intend to reject. The coatings only affect that set of wavelengths but do not affect visible wavelengths in the same way (the goal usually being to affect visible as little as possible). This is why they are called specially-selective (the window industry doesn't use this term much anymore). Note that glass, uncoated, has a surface emissivity of 0.84 but LowE coatings can go as low as 0.018. 172.220.80.45 (talk) 04:46, 13 December 2023 (UTC)[reply]