best qb light setup for 4x8 i can order right now.

[redshift75]

I feel ya. As far as best g/w with the least upfront cost, that could be the way to go.

I just hope you don't get tempted down the road to add supplement lighting and say fuck it to the experimental premise.

No i wont add anything in. i honestly wont think i have to. Got 2 new tents today getting ready to set em up and do a final clean up of the space.

 

[redshift75]

im thinking this right here just to mix it up. or maybe a 4/2 swing on one spectrum over the other.

 

[threatco]

im thinking this right here just to mix it up. or maybe a 4/2 swing on one spectrum over the other.

View attachment 970465

That looks awesome dude! Go for it.

Not to quibble over spectrum more. But that's basically like going with 3250k. Since 3500k is the generic baseline most people go with for seed to harvest, wouldn't you think you want some 4000k in there to keep that inter-nodal space shorter?

I feel like if you are mixing them, that mixing them on board is huge for even distribution. Otherwise, you will have areas that are more 3000k and areas that are more 3500k or whatever. I might be overvaluing uniformity in my canopy light.

 

[redshift75]

That looks awesome dude! Go for it.

Not to quibble over spectrum more. But that's basically like going with 3250k. Since 3500k is the generic baseline most people go with for seed to harvest, wouldn't you think you want some 4000k in there to keep that inter-nodal space shorter?

I feel like if you are mixing them, that mixing them on board is huge for even distribution. Otherwise, you will have areas that are more 3000k and areas that are more 3500k or whatever. I might be overvaluing uniformity in my canopy light.

well im about to consider going with cree xpe2 red 660nm vs epistar what would you think i should do for mix n match on the board? How did you lay out your 3k/4k diodes on the board?

 

[threatco]

well im about to consider going with cree xpe2 red 660nm vs epistar what would you think i should do for mix n match on the board? How did you lay out your 3k/4k diodes on the board?

Which one with Cree? Can you link?

I didn't specify the layout on the board. I assume they just mix them evenly or at worse by row. Each board with be half 3000k and half 4000k.

 

[redshift75]

basically this https://www.alibaba.com/product-detail/Kingbrite-125W-Pre-assemabled-QB288-Quantum_62137771571.html

 

[redshift75]

https://www.cree.com/led-components/products/xlamp-leds-discrete/xlamp-xp-e2 i m going to go with xpe2 660nm red and far red for the ir. and epistar uv most likely on a switch.

 

[threatco]

https://www.cree.com/led-components/products/xlamp-leds-discrete/xlamp-xp-e2 i m going to go with xpe2 660nm red and far red for the ir. and epistar uv most likely on a switch.

Maybe I am missing something.

You are willing to pay $116.00 for a single board of Kingbrite 125W Pre-assemabled QB288 Quantum led board with LM301H mix red Cree 660nm chips.

252pcs SAMSUNG LM301h+36pcs cree 660nm

The closest apples to apples would be this.

$85.00 for the exact same thing. But with Epistar. Kingbrite 125W Pre-assemabled QB288 Quantum led board with LM301H mix red Epistar 660nm chips.

252pcs SAMSUNG LM301h+36pcs epistar 660nm

This product is no longer available.

This product is no longer available.

www.alibaba.com

So my main 3 questions are these.

Why pay 36% more per board to upgrade 14% of your total diodes? Do you buy the value proposition of Cree vs Epistar that much?

Why are you looking at 125w boards? Don't you think 240w 2 panel boards make more sense? You would need about 12 of these single boards. It seems like a wiring mess without added benefit to even distribution of light. I also can't imagine it's as efficient cost-wise either upfront or with electricity.

What do you mean UV on a switch? Like, get UV only on a switch? Not the 660nm or IR too? I never considered that as a possibility.

 

[redshift75]

Maybe I am missing something.

You are willing to pay $116.00 for a single board of Kingbrite 125W Pre-assemabled QB288 Quantum led board with LM301H mix red Cree 660nm chips.

252pcs SAMSUNG LM301h+36pcs cree 660nm

The closest apples to apples would be this.

$85.00 for the exact same thing. But with Epistar. Kingbrite 125W Pre-assemabled QB288 Quantum led board with LM301H mix red Epistar 660nm chips.

252pcs SAMSUNG LM301h+36pcs epistar 660nm

This product is no longer available.

This product is no longer available.

www.alibaba.com

So my main 3 questions are these.

Why pay 36% more per board to upgrade 14% of your total diodes? Do you buy the value proposition of Cree vs Epistar that much?

Why are you looking at 125w boards? Don't you think 240w 2 panel boards make more sense? You would need about 12 of these single boards. It seems like a wiring mess without added benefit to even distribution of light. I also can't imagine it's as efficient cost-wise either upfront or with electricity.

What do you mean UV on a switch? Like, get UV only on a switch? Not the 660nm or IR too? I never considered that as a possibility.

No sorry i was showing you a board that has the setup im looking at. Im talking to abby about what other chips they have available to put on a custom board. I thought about going with both xpe2 ir and lg uv but they dont have them available. So im going to go the 3k/4k mix blend board with cree xpe2 660nm red. They quoted me $144 a 240w set right now. 158 if i want epistar uv/ir with switch

 

[threatco]

No sorry i was showing you a board that has the setup im looking at. Im talking to abby about what other chips they have available to put on a custom board. I thought about going with both xpe2 ir and lg uv but they dont have them available. So im going to go the 3k/4k mix blend board with cree xpe2 660nm red. They quoted me $144 a 240w set right now. 158 if i want epistar uv/ir with switch

LM301H or LM301B at that price?

 

[redshift75]

LM301H or LM301B at that price?

B

 

[threatco]

Assuming LM301B. Then you are potentially getting the same thing as me except for the Cree vs Epistar 660nm's.

I paid 132 per 240w pre-assembled board with UV/IR on a switch.
You are talking 158 for that same thing but with Cree for the 660nm's.

About 20% more total cost to upgrade the brand of 16% of your diodes. It seems steep to me.

*correction*

With a ratio of

512 pcs Samsung lm301B SK leds+24pcs Epistar 660nm+4pcs UV+4pcs IR

That's 24/544=4.4% of your diodes upgraded, for 20% more cost.

 

[redshift75]

Assuming LM301B. Then you are potentially getting the same thing as me except for the Cree vs Epistar 660nm's.

I paid 132 per 240w pre-assembled board with UV/IR on a switch.
You are talking 158 for that same thing but with Cree for the 660nm's.

About 20% more total cost to upgrade the brand of 16% of your diodes. It seems steep to me.

it does seem steep but it looks really attractive for the spectrum blend. given its rating.

 

[redshift75]

That seems pretty slick to me

 

[threatco]

*correction*

With a ratio of

512 pcs Samsung lm301B SK leds+24pcs Epistar 660nm+4pcs UV+4pcs IR

That's 24/544=4.4% of your diodes upgraded, for 20% more cost.

 

[threatco]

I am no expert in Cree vs Epistar. While that color chart makes it seem like its pushing out more red, and if it's doing so with the same ratio of diodes and the same watts it would follow it must be brighter and more efficient to effect the chart that way. But I could not find any concrete comparison.

I found this but it may be moot if XPE is much different.

Seems a conservative guess could put them at about 15-20% brighter.

20% brighter on 4% of your diodes leads to 0.8% overall gain in value, in my rough guestimation. For again 20% more cost.

 

[redshift75]

I am no expert in Cree vs Epistar. While that color chart makes it seem like its pushing out more red, and if it's doing so with the same ratio of diodes and the same watts it would follow it must be brighter and more efficient to effect the chart that way. But I could not find any concrete comparison.

I found this but it may be moot if XPE is much different.
View attachment 970493

Seems a conservative guess could put them at about 15-20% brighter.

20% brighter on 4% of your diodes leads to 0.8% overall gain in value, in my rough guestimation. For again 20% more cost.

good call. ill skip em. I may order 2 that way just to try it.. idk! lol

 

[redshift75]

officially ordered. Went with the 3k/4k mix and 660nm red blend 6 240w kits total.

 

[redshift75]

will have to find some beans for this experiment now have to try and find one i can get for both i think will be best way to do it. because of reg. limits ill only be able to run 6 in each tent.

 

[threatco]

officially ordered. Went with the 3k/4k mix and 660nm red blend 6 240w kits total.

Congrats! Feels good to finally pull the trigger I bet. How many red diodes vs white diodes on the board?

will have to find some beans for this experiment now have to try and find one i can get for both i think will be best way to do it. because of reg. limits ill only be able to run 6 in each tent.

Are you shopping seedbanks/genetics?

Don't have clones as an option? (just asking for experiment variable control value)