Advice needed on lamp models

Rahz

Rahz

Well-Known Member
I'm at the point I can start ordering components for my next (and all new) batch of lamps. I have a couple dilemms going on. Any thoughts on the subject would be appreciated.

My original thought was to bring back the T2, T3 and T4 with increased cob count and higher flux.

However, I suspect many of those who purchased the T3 were buying 2 to put in a 3x3. The replacement T32P would satisfy the base use of 2x3' and 3x4', but two of them will not fit in a 3x3 tent. Technically they will but the outer emitters would be less than 3" from the tent wall and PPFD calculations hitting 1800.

So how many people are running a 3'x2' or 3x4' space? I suspect not many. However, in addition to 3x2 the T32 could also provide more options for those running 5x5 tents. Example:

5x5ppf.jpg

Also, I'm debating whether to build T42s. They would just be two T22s.

It may end up being the following models; T22, T32, T33, or maybe just T22 and T33. Just thinking to myself, but any thoughts or opinions on the matter are appreciated.
 
Yodaweed

Yodaweed

Well-Known Member
Rahz said:
I'm at the point I can start ordering components for my next (and all new) batch of lamps. I have a couple dilemms going on. Any thoughts on the subject would be appreciated.

My original thought was to bring back the T2, T3 and T4 with increased cob count and higher flux.

However, I suspect many of those who purchased the T3 were buying 2 to put in a 3x3. The replacement T32P would satisfy the base use of 2x3' and 3x4', but two of them will not fit in a 3x3 tent. Technically they will but the outer emitters would be less than 3" from the tent wall and PPFD calculations hitting 1800.

So how many people are running a 3'x2' or 3x4' space? I suspect not many. However, in addition to 3x2 the T32 could also provide more options for those running 5x5 tents. Example:

View attachment 3998847

Also, I'm debating whether to build T42s. They would just be two T22s.

It may end up being the following models; T22, T32, T33, or maybe just T22 and T33. Just thinking to myself, but any thoughts or opinions on the matter are appreciated.
Click to expand...
5x15 area here, PPFD seems a bit excessive, maybe try to spread the foot print more.
 
Rahz

Rahz

Well-Known Member
Well, 4 T22s or 2 T42s in a 5x5 will provide about 850 PPFD. For everyone using smaller spaces I figure they might want the extra light. If not there's always the dimmer. T22 dimmed to 500ma puts PPFD just over 1000 and radiometric efficiency over 60%. Total umol/j from the wall at 4.85. I considered running them stock that way, but it's only a few bucks more for the 700ma driver upgrade and the cooling cost is only a small amount more.

Except for 5x5 and larger the footprint is intended to be 1 cob per square foot. I could run the cobs at higher wattage and use fewer but then I would be offering the same thing everyone else is offering.
 
Yodaweed

Yodaweed

Well-Known Member
Rahz said:
@Yodaweed, what PPFD are you running in that space? 850 is more than you prefer?
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Not sure i don't have a par meter or the funds to buy one, i only grow for my own medical purposes.

I'm not sure if PPFD or PAR is an accurate measurement anyways, did you by any chance read this article?

http://www.ledsmagazine.com/articles/2017/08/asabe-publishes-a-metric-standard-for-led-based-horticultural-lighting.html

"As our article described, the first priority was definition of metrics and a new plant biologically active radiation (PBAR) radiometric band that spans 280–800 nm — covering the ultraviolet (UV) region below human visual sensitivity and the far-red region above."
 
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Rahz

Rahz

Well-Known Member
Looks like primarily plant morphology. Not sure if they will work that into the 400-700 range with a single number or provide other metrics. Seems like PAR will still be a prime indicator of plant bulk and flowering potential, though I will keep an eye on things.

But you did mention PPFD being excessive so you must have an idea of what a good target PPFD would be?
 
Yodaweed

Yodaweed

Well-Known Member
Rahz said:
Looks like primarily plant morphology. Not sure if they will work that into the 400-700 range with a single number or provide other metrics. Seems like PAR will still be a prime indicator of plant bulk and flowering potential, though I will keep an eye on things.

But you did mention PPFD being excessive so you must have an idea of what a good target PPFD would be?
Click to expand...
1500 PPFD uniform coverage @ 2 feet?
 
Rahz

Rahz

Well-Known Member
Yodaweed said:
1500 PPFD uniform coverage @ 2 feet?
Click to expand...
1000w DE only provides around 900 PPFD in a 5x5. The T22 and future lamps I will offer are hitting over 1300 PPFD in their respective footprints. I will have and 850 PPFD solution for a 5x5 and a 1085 PPFD solution if I include the T32 in my lineup.
 
Yodaweed

Yodaweed

Well-Known Member
Rahz said:
1000w DE only provides around 900 PPFD in a 5x5. The T22 and future lamps I will offer are hitting over 1300 PPFD in their respective footprints. I will have and 850 PPFD solution for a 5x5 and a 1085 PPFD solution if I include the T32 in my lineup.
Click to expand...
1000w hps in an OG hood puts out 2416 directly under the light @ 18 inches that's why i said even coverage cause it's not as good on the outside

https://growershouse.com/wordpress/wp-content/uploads/2012/09/Raptor-vs-OG-InfoGraphic.jpg
 
Rahz

Rahz

Well-Known Member
Yodaweed said:
1000w hps in an OG hood puts out 2416 directly under the light @ 18 inches that's why i said even coverage cause it's not as good on the outside

https://growershouse.com/wordpress/wp-content/uploads/2012/09/Raptor-vs-OG-InfoGraphic.jpg
Click to expand...
Different bulbs will vary but DE is generally around 2100 umol output which translates into an average PPFD of around 900. I realize not all radiation patterns will be the same but the average is a good way of quantifying what light levels people are growing under. At least for the purpose of this thread PPFD (or output) is the primary concern.
 
Rahz

Rahz

Well-Known Member
Anyway, I don't want to argue about how much light specific bulbs emit. I'm more interested in figuring out whether it's worthwhile to offer a 3x2' base footprint lamp. It's really been a PITA making these final decisions which is why I'm asking for opinions. I have the schematics drawn up for 5 lamps but I don't want to build them all. Like I said, the T42 is just 2x T22s and the T32 is an akward size but would provide more options. I can build 3 lamps to cover any situation, or 2 lamps to cover most situations. I can include the T42 for people who like long lamps... it actually would require two less hangers and half the effort to raise/lower. I actually sold a lot of T4s and I understand the practicality of having a single row of lamps.
 
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