I know there are a million threads on temps, this one is a little different. I just wanted to share something I had noticed and see if others have noticed the same thing.
I hang hygrometers in the canopy to monitor temps, I like to have them not buried under leaves but right around the height of most of the tops, and exposed to the lights. This was always the temp I thought I was at. I also hang hygrometers and old school analog thermometers around the room in different places.
I noticed the other day that ambient temps in the room (not directly under the lamps) tend to run about 5 degrees cooler than under the lamps. When I take infrared readings of the tops I tend to get readings that are about 5 degrees lower than what the canopy thermometers read. So imo the ambient temp in the room away from the lamps pretty much mirror the temps of the canopy (with air cooled lamps).
I think this is important because whenever I tried to dial in VPD numbers I would always give up, it seemed like if I was gonna hit the RH number for what i thought the temp was it was gonna be raining in there before the graph was satisfied. Now when I monitor temps I use ambient room temps and assume that RH is about 5-10% higher in the canopy. All of a sudden it makes more sense.
When you guys monitor temps which reading do you use to monitor your room?
BTW I think I understand why this happens, some IR light is also PAR and the plants adsorb this PAR and ultimately keep themselves cooler because of it, that plus moisture evaporation and nature finds a way.
I hang hygrometers in the canopy to monitor temps, I like to have them not buried under leaves but right around the height of most of the tops, and exposed to the lights. This was always the temp I thought I was at. I also hang hygrometers and old school analog thermometers around the room in different places.
I noticed the other day that ambient temps in the room (not directly under the lamps) tend to run about 5 degrees cooler than under the lamps. When I take infrared readings of the tops I tend to get readings that are about 5 degrees lower than what the canopy thermometers read. So imo the ambient temp in the room away from the lamps pretty much mirror the temps of the canopy (with air cooled lamps).
I think this is important because whenever I tried to dial in VPD numbers I would always give up, it seemed like if I was gonna hit the RH number for what i thought the temp was it was gonna be raining in there before the graph was satisfied. Now when I monitor temps I use ambient room temps and assume that RH is about 5-10% higher in the canopy. All of a sudden it makes more sense.
When you guys monitor temps which reading do you use to monitor your room?
BTW I think I understand why this happens, some IR light is also PAR and the plants adsorb this PAR and ultimately keep themselves cooler because of it, that plus moisture evaporation and nature finds a way.
