5000k is that enough?

scroglodyte said:

2700K is 2700K.............no matter what the source is.

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so wrong since kelvin is derived from the mixture of light and its resultant color. this being said the bulb may be 10,000K for example, but does this mean it does not have any red, or even any red at in the same proportions as a higher kelvin? no. all it means is that the dominant spectrum is blue ther could be green and yellow or none of those and red for all we know. but the overall color is 10,000k.

a lot of T5 manufacturers have stopped using "kelvin" as the standard and use graphs and NM to get the job done of explaining the quality of thier light properly.

im just saying ive grown seedling under 5000k for the longest, since i started growing i immediately noticed seedling grew faster under the redder light than 6500k and faster than 2700k.
after learning a ton about PAR i would love to see a flowering grow under 5000k lights only i have yet to see it done but i have seen what the Florasuns(5000k T5) do in veg but not in flower.

i got about a dozen different T12 tubes in the basement that says ive done my research. i used a mix of 6500k 5000k and 3000k when i flowered under them that was a long time ago and some pretty fat buds for coming off T12 more than people told me it would be.


another really good point is this 2700k hPS bulbs graph vs 2700k CFL bulb graph. similar spectrum but not the same yet both are 2700k.

look i aint tryin to troll all im saying is that 5000k mathematically contains the most PAR of any flouro and can be used from start to finish by itself or with a mix.

3000k 2700k still good bulbs. i would just use the bulb that offers more IMO

Hey Trollyarcturus....lol j/k

I just switched out my 2700K cfl for a 5000K cfl for my 2 6oz cup flowering experiments.I will see what happens.
Kelvin is of course What the human eye primarly sees.The plant will react to the color temps that run off so to speak.In laymans terms....picture a boat cruising along.If the boat was hypotheticaly the light,then we would see just the boat or light.We cannot see the waves this boat/light makes,but the plants green pigment can see it except the green waves.
I suspect your experiment plants are getting some good decent blue with mild reds under a 5000K.I know a vegging plant under 2700k is more stunted than a 6500K in veg.I know I have more resin production with 6500K mixed in with the 2700K during flowering.

To reiterate.I suspect you are bleeding off the 5000K,but is it the most efficient when it comes down to brass tacks.
I like to target the peak absorption,but you may have found a sweet spot so to speak.If I had the time,and extra money I would replace some of my PLL's cause I am all about unconvention,but the 5K cfl in my experiment chamber will do for now.

hey man just saying that i used so far 2 x 23 watt 2700k lights and i have gotten my plant to grow to my surprise pretty decent!
i have choosen this because i am very limited on the cash,but it hasn't completely failed me
this is about a week ago, and i started (roughly)3/4weeks ago and it is a pineapple express autoflower and it is in the early stages of flowering
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and i don't plan on switching lights for now(more like i can't)

but yeah i'm sure what you have will be enough! to get you going
but of course more is always better with cfl

all the best!

You need to hit up Walmart and go grab a few of their 55watt/200watt equiv. CFL's. they are the perfect spectrum for flowering. They also sell 65 watters at Lowes that are a tad bigger, but they come in the red and blue spectrum....For power efficiency though, having about 20 23watt cfls is more cost effective per luman than having 5 or 6 55 watters. that's what I am running. I wish I would have just got splitters and a bunch of lights...although I don't have enough plugs to power them all haha....alwayssss a catch man....

Dalek Supreme said:

Hey Trollyarcturus....lol j/k

I just switched out my 2700K cfl for a 5000K cfl for my 2 6oz cup flowering experiments.I will see what happens.
Kelvin is of course What the human eye primarly sees.The plant will react to the color temps that run off so to speak.In laymans terms....picture a boat cruising along.If the boat was hypotheticaly the light,then we would see just the boat or light.We cannot see the waves this boat/light makes,but the plants green pigment can see it except the green waves.
I suspect your experiment plants are getting some good decent blue with mild reds under a 5000K.I know a vegging plant under 2700k is more stunted than a 6500K in veg.I know I have more resin production with 6500K mixed in with the 2700K during flowering.

To reiterate.I suspect you are bleeding off the 5000K,but is it the most efficient when it comes down to brass tacks.
I like to target the peak absorption,but you may have found a sweet spot so to speak.If I had the time,and extra money I would replace some of my PLL's cause I am all about unconvention,but the 5K cfl in my experiment chamber will do for now.

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oopss! sorry i didnt see this but yeah try it out wont hurt more than a few days if im wrong, right? i was just trying to share my knowledge im glad you took it in stride +rep

I'm veggin with a 5000k.. its going ALOT slower then a 6500k, the plant is green and healthy but growing very very very slowly

its not getting what it needs... i had to fast rush an order of 6500k lights.

Sup guys... i use a 5000k t8 bulb start to finish with great results.... heres some pics...







All different grows.... only thing i notice is buds arent as dense when compared to hps... i still pull decent weight with a lower electric bill and no heat problems... well worth it imo.

808killahz said:

Sup guys... i use a 5000k t8 bulb start to finish with great results.... heres some pics...

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All different grows.... only thing i notice is buds arent as dense when compared to hps... i still pull decent weight with a lower electric bill and no heat problems... well worth it imo.

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WOW!!! I am impressed with your T8 grow,with 5k start to finish aswell.I wondered what plants looked under T8's.Great work,but T5's or PLL's would show you what the latest in floro tech can do.


I tried a 5k for a couple days,and it did support veg growth.Down the road I am thinking of replacing my middle bank of 2 6500k PLL's with 5k's,and see what happens.I think it will give a good spectrum bleed for middle photosynthetic useable radiation.