Why can't you used 4100K bulbs?

FATBOYFRESH said:

This guy follows my post with adverserial spirit.. But doesnt respond to my question.... I know it doesnt take this long to answer..... I know it took longer for you to find this post..comment on iy... Add charts etc.... Lol.... What do you use

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You're wrong about Wein's law so you ask for plant pictures that have absolutely nothing to do with Wein's law? Quit acting like a freaking idiot. Next someone is going to tell you the world is round and you're going to ask for weed pictures. Fluorescent lamps have totally different spectral power distributions than incandescent lamps (black body), and it has nothing to do with weed.

You clearly wasted a lot of money on this bad idea of yours. Getting defensive about it after realizing you're totally wrong makes you look like more of an idiot.

Learn what spectral power distribution means and then go look up what it is for the lamps you're using and realize they're nowhere close to what black body sources look like.

churchhaze said:

You're wrong about Wein's law so you ask for plant pictures that have absolutely nothing to do with Wein's law? Quit acting like a freaking idiot. Next someone is going to tell you the world is round and you're going to ask for weed pictures. Fluorescent lamps have totally different spectral power distributions than incandescent lamps (black body), and it has nothing to do with weed.

You clearly wasted a lot of money on this bad idea of yours. Getting defensive about it after realizing you're totally wrong makes you look like more of an idiot.

Learn what spectral power distribution means and then go look up what it is for the lamps you're using and realize they're nowhere close to what black body sources look like.

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Simply stated... Weins law directly utilizes kelvins in its quotations .... I understasnd a lil bit about spd..... I wonder what you use if anything..... That will tell me alot about yourself.... The spd of ur equipment... And the reasoning..

FATBOYFRESH said:

Weins law directly utilizes kelvins in its quotations

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... for black body sources, aka incandescent lamps. Check the spectral power distribution of the flourescent lamps you're using.

Flourescent lamps have a spectrum like this:

FATBOYFRESH said:

I wonder what you use if anything

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I use 3000k veros, 3500k veros and 3000k cxb, which all have very similar spd.


These are some of the panels I made and use.

3500k 80cri vero 18:


cool white veg lamps:


3000k 80cri cxb:

FATBOYFRESH said:

That will tell me alot about yourself....

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But it says nothing about Wein's law and why your reasoning is flawed. There's another 4000k source btw and it obviously looks totally different than the 4000k flourescent source from a few posts back which are both very different from a 4000k MH spectrum which is also showed a few posts back. None of them are even remotely similar to an incandescent lamp at 4000K (weins law).

Color temperature is a function of spectral power distribution, but many SPDs will result in the same color temperature. It's only consistent for incandescent lamps. Increasing the size of the yellow spike makes color temperature higher, but doesn't actually add red.

For this reason, color temperature should be mostly ignored other than using as a label for the spectral distribution so people can refer to a particular SPD. (for example, people will know which SPD you're talking about if you say vero 3000k 80cri.)

churchhaze said:

... for black body sources, aka incandescent lamps. Check the spectral power distribution of the flourescent lamps you're using.

Flourescent lamps have a spectrum like this:

I use 3000k veros, 3500k veros and 3000k cxb, which all have very similar spd.

These are some of the panels I made and use.

3500k 80cri vero 18:
View attachment 3727118 View attachment 3727119View attachment 3727120

cool white veg lamps:
View attachment 3727121View attachment 3727122

3000k 80cri cxb:
View attachment 3727123View attachment 3727124




But it says nothing about Wein's law and why your reasoning is flawed. There's another 4000k source btw and it obviously looks totally different than the 4000k flourescent source from a few posts back which are both very different from a 4000k MH spectrum which is also showed a few posts back. None of them are even remotely similar to an incandescent lamp at 4000K (weins law).

Color temperature is a function of spectral power distribution, but many SPDs will result in the same color temperature. It's only consistent for incandescent lamps. Increasing the size of the yellow spike makes color temperature higher, but doesn't actually add red.

For this reason, color temperature should be mostly ignored other than using as a label for the spectral distribution so people can refer to a particular SPD. (for example, people will know which SPD you're talking about if you say vero 3000k 80cri.)

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I see..... Isnt led measured in nanometers.... If so.... Why then does led manufactures describe them as K?... Thats whats confusing to me... But besides that.. Without trying to be exactly spot on.... What would be a good K in cfl or les tp use.. I know thr spd is not the same and are a bit .ore full spectrun but couldnt we bolster thr wavelengths we want tp enhance

My best connoisseur run was done in a 160 watt server case useing four plls, 40 watts each, 4100k, V-scrog.
Super frosty and rock hard.
While there may be many to say 4100k is not the optimum for blooming, the proof is in the pudding.
It just works.....

So is there much difference between using a 6400k and 8000k for example sure the blue spectrum is higher, but the growth? Would there be much difference???

EvansInUK said:

So is there much difference between using a 6400k and 8000k for example sure the blue spectrum is higher, but the growth? Would there be much difference???

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When it comes to cfl or floro tubes the more spectrum the better.

When I ran t5 I ran a mix of 2700, 6500, and 10,000k bulbs along with pure par and uv bulbs.

whitebb2727 said:

When it comes to cfl or floro tubes the more spectrum the better.

When I ran t5 I ran a mix of 2700, 6500, and 10,000k bulbs along with pure par and uv bulbs.

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Fair enough. But is there any difference in 6400-10000k I read that over 6400k just reduces yield. Not sure if that is correct or not hence the reason I'm asking from experienced growers and trying to come to an agreement wether I think it' better or not. But that's just going to be my own personal opinion and help me to judge future tents and room setups.

EvansInUK said:

Fair enough. But is there any difference in 6400-10000k I read that over 6400k just reduces yield. Not sure if that is correct or not hence the reason I'm asking from experienced growers and trying to come to an agreement wether I think it' better or not. But that's just going to be my own personal opinion and help me to judge future tents and room setups.

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Yea. I've grown start to finish with all 2700, all 6500 and different mixes.

A 50/50 mix works great if not spending for horticulture specific bulbs. Half 2700 and 6500. The mix gives a mix of the results.

All 2700 gave more weight and all 6500 through flower gave less weight but slightly better smoke.

I know of other t5 growers saying that all 4100k yielded the best.

I'm using 4000k cobs now from start to finish and it works good.

To answer your question. 10,000k is bluer. Lacks red spectrum. It's great for finishing the last two weeks or mixed in. I've heard some guys swear by 7500 and higher metal halide.

In fluro 2700 with have some blue and 6500 will have some red. 4000 to 5000k will be closer to real light as it covers more of the spectrum.

Spectrum plays a role. I say if possible to run mixed spectrum.

All those spectrums will grow and a lot of it is the grower and genetics. If your genetics, grow skill and environment are dialed in then tweaking the spectrum will be to your advantage.

I got a long thread where I used to grow with a cheap $100 4ft 8 bulb t5 with mixed agromax horticulture bulbs and turned out some great smoke with it.

I've considered adding a pure par bulb and a 10,000k+uva bulb back in with my cob LEDs.

I also have a unit farm led that has a mix of red white and blue Cree and osram diodes. It grows great smoke.

It comes to preference. Hid, floro or led and what mix of those. In my preference the more spectrum the better the smoke.

whitebb2727 said:

Yeah I know of other t5 growers saying that all 4100k yielded the best.

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You say t5 and 4100k ? I was looking at this earlier found they were 6400k? Am I looking at old or new bulbs? In these. Says up to 8000 lumens.

Was just thinking of selling my 200w cfl's and replacing it with these. Due to noise etc and heat. Thought this may have been a better alternative. As my tent is 80x80x160cm and under my stairs.

EvansInUK said:

You say t5 and 4100k ? I was looking at this earlier found they were 6400k? Am I looking at old or new bulbs? In these. Says up to 8000 lumens.

Was just thinking of selling my 200w cfl's and replacing it with these. Due to noise etc and heat. Thought this may have been a better alternative. As my tent is 80x80x160cm and under my stairs.

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Yes. 6400k is common in t5. So is 3000k.

I used a durolux t5 off amazon $119. Agromax bulbs. Around $7 to 9 a piece.

whitebb2727 said:

Yes. 6400k is common in t5. So is 3000k.

I used a durolux t5 off amazon $119. Agromax bulbs. Around $7 to 9 a piece.

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I'e come across those agromax bulbs on a few 600hps systems I was looking at. Maybe mh I'm not sure now I just typed that lol. So what was your kelvin 6400 or 4100 with agro? I'm interested in what you said about more yields off the 4100.

EvansInUK said:

I'e come across those agromax bulbs on a few 600hps systems I was looking at. Maybe mh I'm not sure now I just typed that lol. So what was your kelvin 6400 or 4100 with agro? I'm interested in what you said about more yields off the 4100.

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Check thier bulbs out. It varies. Some are specialty bulbs that cover narrow bands.

https://www.htgsupply.com/categories/grow-light-parts/grow-light-bulbs/t5-bulbs

The pure uv is a bad mofo. Don't work under it. It needs to be a few feet off the canopy and only run a few minutes on each hour.

whitebb2727 said:

Check thier bulbs out. It varies. Some are specialty bulbs that cover narrow bands.

https://www.htgsupply.com/categories/grow-light-parts/grow-light-bulbs/t5-bulbs

The pure uv is a bad mofo. Don't work under it. It needs to be a few feet off the canopy and only run a few minutes on each hour.

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Some quality bulbs on there. Have you seen any

4100k
5500k
6800k
7250k

I fancy mixing it up with these colours. I've found one bulb only in 7250 and it' 2000w way to powerful for my 80x80x160cm tent. But the dam house down lol. But have you seen any 4100k tubes for t5?

I doubt you will find 5500, 6800 tubes for a t5 although it would be nice to mix it up. Also 7250 is way to high for a T5 so only MH I think it was that I found....

EvansInUK said:

Some quality bulbs on there. Have you seen any

4100k
5500k
6800k
7250k

I fancy mixing it up with these colours. I've found one bulb only in 7250 and it' 2000w way to powerful for my 80x80x160cm tent. But the dam house down lol. But have you seen any 4100k tubes for t5?

I doubt you will find 5500, 6800 tubes for a t5 although it would be nice to mix it up. Also 7250 is way to high for a T5 so only MH I think it was that I found....

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Walmart used to carry them. Most hardware stores like Ace or Lowe's will have them. GE brand real cheap. Amazon has them. I think agromax has a store in on eBay that's cheaper than htg. You would have to do a search.

1000bulbs.com or what ever it it's called.

whitebb2727 said:

Walmart used to carry them. Most hardware stores like Ace or Lowe's will have them. GE brand real cheap. Amazon has them. I think agromax has a store in on eBay that's cheaper than htg. You would have to do a search.

1000bulbs.com or what ever it it's called.

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I'm from the UK so the shops you mentioned are not over here I have tried searching for hours on Google and I couldn' find them.