InTheShed Grows Inside & Out: Jump In Any Time

[Graytail]

OK, Shed, I did some legwork for ya.

I always use octopart when I'm looking for price and selection of these things. If you pick up the model number from a different source, you can just plug it into the search bar with octopart and you'll get a list of suppliers and prices.

So anyway, Digikey has both the single and double row strips in 22" length:

SI-B8U261560WW Samsung Semiconductor, Inc. | Optoelectronics | DigiKey

SI-B8U521560WW Samsung Semiconductor, Inc. | Optoelectronics | DigiKey

If it were me, I'd use single row strips. They'll run cooler and you'll be able to better spread them across the sky. There isn't much price difference.

 

[Graytail]

It's true that there's a lot of wasted light in a white spectrum, but the blue and red bands are still boosted, with peaks in the plant's spectrum, and their efficiency more than makes up for it. Plants do use the green and yellow bands - just not as much of it.

 

[nobodyhere]

I was just at the Kind LED website (a sponsor here) and they had a great video where they compared a bunch of lights and measured ppfd etc. to see who came out on top. Of course they did, but what was interesting was they're info on white vs. non-white LED lights for plants. He said that the yellow and green spectrum is mostly ignored by the plants yet that is what we perceive as making white boards look brighter.

It's an interesting video no matter what you're kind interested in. You can see the time stamp below for the chart in real time.

I own a Kind 300 that pulls 175w at the wall.

Kind is correct, there is a lot of light in a white LED that the plant does not really 'use'. Hence using PAR as a measure, whites have about half the par of reds as I understand it. Will watch video.

But, owning both lights, it's really no contest. a single 100w 4k vero grows a heck of a lot more than their red 175w fan fixture (has 4 fans in that wattage~6-12w?).

 

[InTheShed]

OK, Shed, I did some legwork for ya.
I always use octopart when I'm looking for price and selection of these things. If you pick up the model number from a different source, you can just plug it into the search bar with octopart and you'll get a list of suppliers and prices.
So anyway, Digikey has both the single and double row strips in 22" length:
SI-B8U261560WW Samsung Semiconductor, Inc. | Optoelectronics | DigiKey
SI-B8U521560WW Samsung Semiconductor, Inc. | Optoelectronics | DigiKey
If it were me, I'd use single row strips. They'll run cooler and you'll be able to better spread them across the sky. There isn't much price difference.

Wow thanks Graytail! Can you post a link to the octopart website? I'd like to see what the SI-B8UZ91B20WW goes for now as well. Also, at 22" long what would be the max coverage lengthwise?

It's true that there's a lot of wasted light in a white spectrum, but the blue and red bands are still boosted, with peaks in the plant's spectrum, and their efficiency more than makes up for it. Plants do use the green and yellow bands - just not as much of it.

Most of the ones they featured pretty much drop off at the red end with the exception of Van's Spyder, which drops off but not quite as soon.

Of course, I'm talking based on what I know so far, which ain't much I have to admit!

 

[InTheShed]

I own a Kind 300 that pulls 175w at the wall.

Kind is correct, there is a lot of light in a white LED that the plant does not really 'use'. Hence using PAR as a measure, whites have about half the par of reds as I understand it. Will watch video.

But, owning both lights, it's really no contest. a single 100w 4k vero grows a heck of a lot more than their red 175w fan fixture (has 4 fans in that wattage~6-12w?).

They're out of stock on those now. Let me know your thoughts on the video since you have Timber and Kind.

 

[Graytail]

Here's Octopart

Octopart: Electronics Parts Search Engine

The datasheet for the strips

And the LM561C spectrum

LM561C Spectrum.jpg

• Graytail
• Nov 19, 2018

 

[InTheShed]

Here's Octopart
Octopart: Electronics Parts Search Engine
The datasheet for the strips
And the LM561C spectrum

Wow thanks GT! You are all over this.

Big drop-off on the red end even at 2700K on those.

 

[Graytail]

My room is pretty pink ... these are 3000Ks.

DSCN9083.JPG

• Graytail
• Sep 13, 2018

I just grabbed the first spectrum I saw on Images, but the drop-off is only at the very top end. Someday, I'll get some near-red/far-red to play with.

 

[FelipeBlu]

I really like that 4000K spectrum.

 

[InTheShed]

My room is pretty pink ... these are 3000Ks.
I just grabbed the first spectrum I saw on Images, but the drop-off is only at the very top end. Someday, I'll get some near-red/far-red to play with.

Doesn't look like a lack of far reds hurt those flowers! Gorgeous colas .

 

[InTheShed]

I really like that 4000K spectrum.

For flowering photos? I thought 3500K was more all-purpose.

 

[Amy Gardner]

DSCN9083.JPG

• Graytail
• Sep 13, 2018

.

 

[Amy Gardner]

For flowering photos? I thought 3500K was more all-purpose.

Mine is all 3500k

 

[Graytail]

I really like that 4000K spectrum.

Here's the 4000Ks in the veg space - same camera - same settings.

DSCN9640.JPG

• Graytail
• Nov 19, 2018

DSCN9643.JPG

• Graytail
• Nov 19, 2018

 

[InTheShed]

Definitely bluer. Is 3500K a better start-to-finish than 3000K, particularly since my plants live outside during daylight hours?

Let me explain my grow to see if it helps. Every morning the plants go into the sun. During veg, every evening they go in the shed under the lights. When I decide to flip my photos, they go into the shed for 12 hours of darkness. So I'm waiting for my autos to finish (so I can get them max light 20/4) before I convert the shed to dark at night and flip the photos. During the winter I try not to run autos while I'm flowering photos.

What that means practically is that only autos will be flowered under these lights. The only time the photos will be under them during flower is if it's cloudy or raining. During veg, everything is under the lights at night.

Does that change any decisions about color temp?

Confused?

 

[Amy Gardner]

I’m not! That makes perfect sense

Couldn’t remember what temp to set my MB2 to (thanks for the save), but Shed’s grow makes perfect sense to me. Still have half a brain

 

[InTheShed]

I’m not! That makes perfect sense

Couldn’t remember what temp to set my MB2 to (thanks for the save), but Shed’s grow makes perfect sense to me. Still have half a brain

Phewf! And I think all of us combined are a super-brain.

 

[Graytail]

Interesting question for autos. I don't have enough experience with them to know.

Do we want more leaf growth in an auto, or more flower growth?

 

[InTheShed]

Probably more leaf and stalk growth as getting them to the biggest size before they leap into flower is the best scenario.

 

[Graytail]

Well, 4000K should shorten internode length, and that wouldn't be all that welcome, so 3000K or 3500K might be better.

Dunno.