Ooh, I guess it just read the nearest surface then. I just bought the temp gun and missed that. I have an ambient thermometer about 7" from the floor that reads 79F. I have a lamp with a ceramic heat emitter.
The cooler uth is warming the bottom. I know it doesn't heat air. Without it, the substrate was measuring under 74. I use it with the thermostat to bump it closer to 80.
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