Ask a Question forum: 5000k vs 6500k?

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Maryland
Alexp08
Apr 20, 2017 12:30 PM CST
I understand the kelvin scale as I have used it alot for aquarium plants. But with household plants, is there a big difference in growth rate amongst the two? Currently I am using 5000k cfl bulbs and everything seems to be doing well. But I'm curious as to if I'll get faster growth rate if i switch to 6500k. Thanks!
Name: Daisy I
Reno, Nv (Zone 6b)
Not all who wander are lost
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DaisyI
Apr 20, 2017 1:53 PM CST
Welcome!

It depends upon what plants you are growing and how far the lights are above the plants.

Here's an easy test:

If shade plants, when you put your hand at the level of the plants, your lights should not cast a shadow.

If semi-shade, your hand should cast a very soft shadow.

If bright, your hand should cast a sharp shadow.

Grow lights are full spectrum (day light bulbs) with 6500K. But if your plants are doing well under the 5000K lights, why change them?

The true test is if the plants are the right color for that particular species (happy dark green is not neccessarily the right green) and if they bloom.
Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and proclaiming...."WOW What a Ride!!" -Mark Frost

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Maryland
Alexp08
Apr 20, 2017 3:39 PM CST
Thanks for the reply. They are doing fine under the 5000k but if they would do better under the 6500k is change them. I'm still new to house plants maybe 2 month into it lol
Name: Daisy I
Reno, Nv (Zone 6b)
Not all who wander are lost
Garden Sages Plant Identifier
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DaisyI
Apr 20, 2017 4:15 PM CST
Most 'house plants' became house plants because they come from shady tropical areas. They lend themselves well to indoor gardening conditions.

What plants are you growing? Most house plants do just fine in a bright window.

Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and proclaiming...."WOW What a Ride!!" -Mark Frost

Webmaster: osnnv.org
Maryland
Alexp08
Apr 20, 2017 4:21 PM CST
Well i habe no windows in my apartment so strictly under cfl's. I have spider plants, orchids, a parlor palm, areca palm, a handful of prayer plants rabbit fern, persian shields and a few other misc that I picked up from walmart.
Name: Daisy I
Reno, Nv (Zone 6b)
Not all who wander are lost
Garden Sages Plant Identifier
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DaisyI
Apr 20, 2017 4:56 PM CST
Those are all good houseplants and should do well under lights. If you want to experiment, replace one of your 5000K bulbs for a 6500K bulb and see how the plants under that light do compared to the others.

If you post some photos of your plants, we might be able to tell you if they could benefit from more light.
Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and proclaiming...."WOW What a Ride!!" -Mark Frost

Webmaster: osnnv.org
Name: Mac
Soon to be MidCoast, ME (Zone 6a)
Ex zones 4b, 8b, 9a, 9b
Cat Lover Birds Hummingbirder Butterflies Frogs and Toads Vermiculture
Critters Allowed Vegetable Grower Canning and food preservation Annuals Morning Glories Sedums
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McCannon
Apr 21, 2017 1:14 PM CST
@Daisyl, You can ask 10 people what is the best color temperature to use, and get 20 different answers. Generally speaking, anything in the "daylight" range, 5000K to 6500K should work well for you, since "daylight" is what you're trying to mimic indoors. I don't think you will notice a visible difference in growth rate from one end of that range to the other.
The aboriginal people of the world and many other cultures share a common respect for nature and the universe, and all of the life that it holds. We could learn much from them!
Name: Daisy I
Reno, Nv (Zone 6b)
Not all who wander are lost
Garden Sages Plant Identifier
Image
DaisyI
Apr 21, 2017 2:27 PM CST
Mac, I was encouraging the OP to stick with what they've got but if Alex really wants to see the difference, I suggested a simple experiment.

There is a lot of difference between 5000k and 6500k. Many 'houseplants' will fry under 6500k (ie, Phalaenopsis) but be very happy under 5000k. The spider plant, on the other hand, might like more light.
Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and proclaiming...."WOW What a Ride!!" -Mark Frost

Webmaster: osnnv.org
Name: Mac
Soon to be MidCoast, ME (Zone 6a)
Ex zones 4b, 8b, 9a, 9b
Cat Lover Birds Hummingbirder Butterflies Frogs and Toads Vermiculture
Critters Allowed Vegetable Grower Canning and food preservation Annuals Morning Glories Sedums
Image
McCannon
Apr 21, 2017 3:36 PM CST
@Daisyl, I'm inclined to feel the same way. If what you have works, then stick with it, or, as you suggested, do some experimentation. I imagine there are many plants that thrive in a shady environment that would do poorly under full sun. But many people grow other than "house plants" indoors. Without all the specifics it's hard to guess the actual conditions for each person's situation. It's all about experimentation.
The aboriginal people of the world and many other cultures share a common respect for nature and the universe, and all of the life that it holds. We could learn much from them!
Name: Daisy I
Reno, Nv (Zone 6b)
Not all who wander are lost
Garden Sages Plant Identifier
Image
DaisyI
Apr 21, 2017 5:42 PM CST
Here you go:

Alexp08 said:Well i habe no windows in my apartment so strictly under cfl's. I have spider plants, orchids, a parlor palm, areca palm, a handful of prayer plants rabbit fern, persian shields and a few other misc that I picked up from walmart.



Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and proclaiming...."WOW What a Ride!!" -Mark Frost

Webmaster: osnnv.org
Maryland
Alexp08
Apr 21, 2017 7:02 PM CST
DaisyI said:Mac, I was encouraging the OP to stick with what they've got but if Alex really wants to see the difference, I suggested a simple experiment.

There is a lot of difference between 5000k and 6500k. Many 'houseplants' will fry under 6500k (ie, Phalaenopsis) but be very happy under 5000k. The spider plant, on the other hand, might like more light.


Thanks for the responses everyone! How come phals will fry under 6500k but not 5000k If both bulbs are the same watts?
Name: Daisy I
Reno, Nv (Zone 6b)
Not all who wander are lost
Garden Sages Plant Identifier
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DaisyI
Apr 21, 2017 9:07 PM CST
Watts are a measure of power while Kelvins are a measure of temperature.

Phalaenopsis like to live in deep shade - that's why they do so well in houses.
Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and proclaiming...."WOW What a Ride!!" -Mark Frost

Webmaster: osnnv.org
Maryland
Alexp08
Apr 21, 2017 10:51 PM CST
DaisyI said:Watts are a measure of power while Kelvins are a measure of temperature.

Phalaenopsis like to live in deep shade - that's why they do so well in houses.


Ohh okay, so should I drop them down to say 2700kelvin?
Name: Daisy I
Reno, Nv (Zone 6b)
Not all who wander are lost
Garden Sages Plant Identifier
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DaisyI
Apr 21, 2017 11:33 PM CST
No, stick with your 5000k
Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and proclaiming...."WOW What a Ride!!" -Mark Frost

Webmaster: osnnv.org
Name: Mac
Soon to be MidCoast, ME (Zone 6a)
Ex zones 4b, 8b, 9a, 9b
Cat Lover Birds Hummingbirder Butterflies Frogs and Toads Vermiculture
Critters Allowed Vegetable Grower Canning and food preservation Annuals Morning Glories Sedums
Image
McCannon
Apr 21, 2017 11:42 PM CST
It would be helpful to know the specifications of the lamps you are using. If you are using fluorescent lamps they will have a alpha-numeric code printed on them (eg. F32T8 followed by letters and/or numbers).

Color temperature, in Kelvins, is actually the color radiated by any given light source and only related to thermal temperature by reference: http://www.lightbulbsdirect.co...
The "apparent" brightness may appear brighter or dimmer due to the radiated color. There is little if any actual radiated temperature difference between 5000K and 6500K lamps.

Of more concern would be the lumen rating ( brightness) of any given lamp. For example, the popular T5HO 48" 5000K grow lamps are rated around 4500 lumens (very bright) as compared to a conventional T8 48" 5000K conventional shop light which is rated around 2600 lumens (moderately bright). The brightness level changes due to proximity the the light source.

Obviously, a plant that lives predominantly in deep shade would not do well under a "very bright" light source whereas a "moderately bright" source might cause no damage at all.
The aboriginal people of the world and many other cultures share a common respect for nature and the universe, and all of the life that it holds. We could learn much from them!
Maryland
Alexp08
Apr 22, 2017 10:23 AM CST
I see. Okay thanks! As far as the lamps they are just generic desk lamps from walmart. The bulbs are 26w 5000k 1600lumens cfl.
Name: Mac
Soon to be MidCoast, ME (Zone 6a)
Ex zones 4b, 8b, 9a, 9b
Cat Lover Birds Hummingbirder Butterflies Frogs and Toads Vermiculture
Critters Allowed Vegetable Grower Canning and food preservation Annuals Morning Glories Sedums
Image
McCannon
Apr 22, 2017 10:49 AM CST
Alexp08 said:The bulbs are 26w 5000k 1600lumens cfl.


Those should be fine, but feel free to experiment. Just keep an eye on your plants to make sure any changes are working as expected. Best of luck Smiling .

The aboriginal people of the world and many other cultures share a common respect for nature and the universe, and all of the life that it holds. We could learn much from them!
Maryland
Alexp08
Apr 22, 2017 6:17 PM CST
Thanks for the help everyone! Much appreciated!
Name: Daisy I
Reno, Nv (Zone 6b)
Not all who wander are lost
Garden Sages Plant Identifier
Image
DaisyI
Apr 22, 2017 6:52 PM CST
Keep us posted!
Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and proclaiming...."WOW What a Ride!!" -Mark Frost

Webmaster: osnnv.org

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