Aqua Man
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Fair point brother. I did point out why you found your cobs could run closer. Partially due to a differece in ppfd and IR but also less wattage which would be less intensity. Part of it was me not know timber removed the lenses.I did link the specific fixture in my earlier post that you already quoted, its just above the link to the hlg.
All I could offer was my personal experience with the lights being discussed. I thought it could be useful to some people trying to make decisions even if it lacked me going into detail about every aspect of each light and why they perform the way they do.
When you stated specifically that timbers fixtures needed to be further away from the canopy than hlgs fixtures this was contrary to my experience and the manufacturers info so I wanted to understand where you were coming from. I was asking more specifically in regards to the fixtures being offered by both brands rather than getting into all the variations of light design possible.
Im just trying to understand. I mean honestly I dont even think the optimal operating height really gives one light an edge over the other, I'm happy with both of them but if there is a good reason I should be using them differently I would like to know.
Shortly after I joined this forum @Aqua Man and @MIMedGrower helped convince me of using the same nutrients for the whole grow rather than switching to bloom nutrients in flower. This was a new idea to me but aqua man pointed out a study as well as mimeds grows that helped convince me to change. Because of this (and this goes for others on the forum I respect as well) if aqua man says something contrary to my understanding Im more likely to press him on explaining it because I'm really giving him the benefit of the doubt and need someone to point out where or what I am misunderstanding.
That being said, in the absence of evidence to convince me otherwise, I can not rule out the possibility that I might be right or that maybe something was misunderstood. In this case I think most of the confusion was due to aqua man making reasonable statements that were unfortunately based on out of date/not current hardware. Unless I am mistaken it seems like he has come around to the fact the the majority current of fixtures offered by hlg optimally operate at a greater height than than the majority of timbers fixtures.
But I think you will find if all things equal the boards can be run closer. This would require a single QB and single COB tested using quantum meter. Both at say 100w you will find the QB can be run closer. I understand that when put into a fixture it changes things. The real issue here is what exactly is causing differing opinions. I said MAY have to run higher with timbers. I understand it's not always the case depending on the boarda used and configuration of the fixtures.