Combination Cree COB / Samsung strip build?

J

jonnynobody

Well-Known Member
Has anybody seen someone DIY a Samsung strip build with COB's incorporated too? Maybe it's an outright silly suggestion? I'm really impressed with how my plants are responding to COB lighting in one of my nurseries. The leaves are praying to the light in a way I've never seen happen under my T5. I get a little of that effect under my quantum boards, but nothing like what I'm seeing under the 120W of COB lighting. I really don't even see anyone using COB's anymore for the most part. This is confusing to me considering the results I'm observing in my nursery. It just kinda blows me away that the industry seems to have left COB's in the rear view mirror and moved full steam ahead with strip / quantum board builds.

Maybe I need to ask a question and hopefully someone can answer it. Is the spectrum of light emitted by a high quality Cree COB in 3000k something that can be duplicated in a strip / quantum board build? The 2 quantum boards I have been using combine 3000k and 5000k chips to produce what the vendor calls a "daylight" spectrum. If I assembled a strip build with 3000k lm301b strips would that light produce the same spectrum as the Cree COB in 3000k? I just want to make sure I'm not approaching this from the wrong angle. After ordering 2 quantum boards I'm at the point I would like to customize my own unit. Even if I start with something small it would still be a great learning experience.

One more question too. Would it even make any sense from a technical perspective to combine COB's with Samsung strips in a light build? If both COB's and strips are rated for 3000k are both producing the exact same spectrum of light?
 
7CardBud

7CardBud

Well-Known Member
The praying may be directed towards the very intense small area where the light is emitted.
 
J

jonnynobody

Well-Known Member
7CardBud said:
The praying may be directed towards the very intense small area where the light is emitted.
Click to expand...
My quantum boards produce exponentially more light than the COB's yet the plants under the COB's look healthier and more vibrant. For the most part I have never seen the same effect under any of my q boards. To be fair my q boards are not the same spectrum though. The COB's are 3000k and the quantum boards are a mixed 3000k / 5000k spectrum, so I'm truly not comparing apples for apples here. Maybe the answer I'm seeking is a simple one. Does a quantum board with all 3000k chips produce the effect I'm observing under my 3000K COB's? It might just be that simple. I'm thinking I might build a small 3000k strip build and put it to the test. What I'm driving for here is to figure out if it's the 3000k spectrum or if it's the COB in a 3000k that produces some unique spectrum of light that isn't emitted from a 3000k strip / quantum board build.
 
NukaKola

NukaKola

Well-Known Member
There’s quite a few people that still use DIY COB’s or Timbers COB fixtures.

Boards and strips will produce a better light spread but COB’s have nice penetration.

I don’t see too many COB & strip combo builds. I’ve seen some builds using the HLG QB 96’s with strips which is kind of similar.
 
J

jonnynobody

Well-Known Member
NukaKola said:
There’s quite a few people that still use DIY COB’s or Timbers COB fixtures.

Boards and strips will produce a better light spread but COB’s have nice penetration.

I don’t see too many COB & strip combo builds. I’ve seen some builds using the HLG QB 96’s with strips which is kind of similar.
Click to expand...
Does 3000k in COB's produce the same spectrum as 3000k in strips? I do like the penetration / intensity of COB's. They're so bright they literally cast a shadow from the leaves onto the tent floor. My quantum boards are dam bright but they don't do that :)
 
NukaKola

NukaKola

Well-Known Member
jonnynobody said:
Does 3000k in COB's produce the same spectrum as 3000k in strips? I do like the penetration / intensity of COB's. They're so bright they literally cast a shadow from the leaves onto the tent floor. My quantum boards are dam bright but they don't do that :)
Click to expand...
3000k spectrum will vary from different manufacturers. The idea with boards and even more so with strips is to spread out the light so much that you can avoid shadows. That’s the whole benefit LED’s have over single light sources like HID’s.
 
1

1212ham

Well-Known Member
jonnynobody said:
Has anybody seen someone DIY a Samsung strip build with COB's incorporated too? Maybe it's an outright silly suggestion? I'm really impressed with how my plants are responding to COB lighting in one of my nurseries. The leaves are praying to the light in a way I've never seen happen under my T5. I get a little of that effect under my quantum boards, but nothing like what I'm seeing under the 120W of COB lighting. I really don't even see anyone using COB's anymore for the most part. This is confusing to me considering the results I'm observing in my nursery. It just kinda blows me away that the industry seems to have left COB's in the rear view mirror and moved full steam ahead with strip / quantum board builds.

Maybe I need to ask a question and hopefully someone can answer it. Is the spectrum of light emitted by a high quality Cree COB in 3000k something that can be duplicated in a strip / quantum board build? The 2 quantum boards I have been using combine 3000k and 5000k chips to produce what the vendor calls a "daylight" spectrum. If I assembled a strip build with 3000k lm301b strips would that light produce the same spectrum as the Cree COB in 3000k? I just want to make sure I'm not approaching this from the wrong angle. After ordering 2 quantum boards I'm at the point I would like to customize my own unit. Even if I start with something small it would still be a great learning experience.

One more question too. Would it even make any sense from a technical perspective to combine COB's with Samsung strips in a light build? If both COB's and strips are rated for 3000k are both producing the exact same spectrum of light?
Click to expand...
Got a link to your boards? The vendor calling it daylight spectrum is useless, they should give the color temp of the board and show the spectrum. I'm guessing they use a lot of 5000k to get higher output and efficacy numbers.

I don't think 3000k cobs and strips would necessarily have exactly the same spectrum, but probably very close. I think color temp numbers are an average of the spectrum? I doubt there's anything to gain mixing cobs and strips.

As for cobs vs strips vs boards, I think the size of the area, ceiling height and number of cobs over a given area affects the spread/distribution of light. One cob in a 2x2 is different than 64 cobs over an 8 x 8.
 
J

jonnynobody

Well-Known Member
1212ham said:
Got a link to your boards? The vendor calling it daylight spectrum is useless, they should give the color temp of the board and show the spectrum. I'm guessing they use a lot of 5000k to get higher output and efficacy numbers.

I don't think 3000k cobs and strips would necessarily have exactly the same spectrum, but probably very close. I think color temp numbers are an average of the spectrum? I doubt there's anything to gain mixing cobs and strips.

As for cobs vs strips vs boards, I think the size of the area, ceiling height and number of cobs over a given area affects the spread/distribution of light. One cob in a 2x2 is different than 64 cobs over an 8 x 8.
Click to expand...
The 660w board: https://www.alibaba.com/product-detail/Shenzhen-sunlight-lm301b-quantum-Bar-grow_62551149687.html?spm=a2756.order-detail-ta-bn-b.0.0.7ea22fc2ibm7tU
The 110w board: https://www.alibaba.com/product-detail/Full-Spectrum-110W-qb288-Samsung-lm301b_62512497620.html?spm=a2756.order-detail-ta-ta-b.0.0.3c032fc2vWbMJz
The 450w board: https://www.amazon.com/Spider-Farmer-SF-4000-Dimmable-Spectrum/dp/B07TXFR69M
 
You must log in or register to reply here.
Top