Check the winners The Grow Awards 2026 🏆
Start My Diary
Start My Diary
Log In
Start My Diary
Home
Diaries
Strains
Shorts
Questions
Contests
Growers
Seeds
Breeders
Nutrients
Equipment
Blog
English
Log In
Sign Up
Following
Follow
Brands
&
Growers
to get updates
Back to Grow Questions
Optimal Veg Light Spectrum?
BlumenBot
started grow question 6y ago
If you had to pick one light color for veg only, never to be used for flower, what would it be? 4000k, 5000k, 6000k, 6500k?
Solved
Setup. Lighting
likes
TheUk420Show
answered grow question 6y ago
3200k my personal or 5000k a mixture of both would be Ideal I don't know why you would want to only chose one though. This is all LED based I assume are you counting MH bulbs they can be very good for vegative growth just expensive to run.
likes
Complain
Selected By The Grower
ChitownCannaChica
answered grow question 6y ago
I have a veg only—- 4500k. 4000 would be good! ✌️🏻💚🌿
likes
Complain
Crawlndog
answered grow question 6y ago
Personally, I would use 3100K-4000K for Veg... would never go below 3000k
likes
Complain
Similar Grow Questions
Solved
Kitties_and_Colas
Does anyone else use x2 315watt CMH lights in just a 4x4? Are we overdoing it a little? No bleaching or foxtails and the plants seem happy..curious to hear some opinions. Ty friends!! 🐱
Week 12
Setup. Lighting
5y ago
7
3
Solved
Burrito
Ppfd amount?
So I've got some amazon LED lights and the only informations I've got is that the lights are 200w and the ppfd map down here. What's the best ppfd amount for vegetative and flowering stage to have the biggest yields?
Week 7
Setup. Lighting
6y ago
5
6
Solved
Rooflower
Whats going on with my Grow lights ?
Hey there , I was looking at that picture and noticed a difference brightness of those lights and the red color differ At least at the camera lens ! They supposed to be the same wattage 🤔 So I was wondering , is that the reason why BananaOG is a bit smaller and underdeveloped 🤓
Week 9
Setup. Lighting
5y ago
3
Solved
ihatemycat
UV led strip
Has anyone tried or knows if there are any benefits to adding a UVA/UVB led strip? I currently have a 18w strip on one side of the growbox as a test, the specifications should be as follows: http://www.ledlightinghut.com/files/365nm%20UV%20SMD5050%20LED%20datasheet.pdf
Setup. Lighting
5y ago
1
4
Solved
ManiPawPatrol
Led distance
I’ve got the lights at 50cm right now at 25% Planning to put it at 50% and 70cm height in the next few days. Any tips? Thanks 🙏
Week 2
Setup. Lighting
4y ago
2
2
Solved
ShivaPriya
Confused with light schedules for outdoor growing
Hi fellow growers, I'm really confused with light schedules for outdoor growing. Everywhere I see 18/6 for veg and 12/12 for flowering. However at my place I get ~13hours of daylight (not always sunlight) Would my plants get into flowering if daylight is reduced to ~11 hours?
Week 1
Setup. Lighting
Setup. Outdoor
Feeding. Schedule
5y ago
5
4
Solved
Nurse
possible light burn help me tanx
I have two lights, spider sf 1000 and viparspectra p1000. My plants have burn marks. I do not know if it is from lights or fertilizers. I now keep them 18 inches apart. Can anyone tell me the light distance table? How far should they be now?
Setup. Lighting
6y ago
1
2
Solved
Indicaman2015
Viparspectra P2000 height and intensity
For those that have experience with the light I'm using, Viparspectra P2000, how high and what intensity percentage should I have it? Currently I'm at 21" at 75% power. Also, I run it 24/7. I have an app on my phone and it says my DLI is at like 56 which seems way too high.
Week 3
Setup. Lighting
3y ago
5
5
Solved
roma79000
Culture intérieure
Bonjour a tous ;) voilà mon problème j'ai un kit de 120x120x200 600W , il fais 30 degrés donc assez chaud je voudrais savoir comment faire pour pouvoir réussir à baisser la chaleur :/... Merci ;)
Setup. Lighting
6y ago
1
2
Solved
TerrazasBrew
Increase light hours autoflower
My autoflowers are 6 weeks old and showing flowering signs. Can I increase the number of light hours from 17hrs to 20/22/24hrs? Does it cause light stress and can trigger vegetation or make it hermaphrodite?
Week 5
Setup. Strain - Autoflowering
Setup. Lighting
5y ago
4
3
Solved
ItsGrowingOnMe
Is this enough? 2 mars hydro 600 TS or 200 watts of led in a 24x24x36 tent,
Using a 24x24x36 tent, I have 1 mars 600 ts (100 watts) in there for one plant. I’m going to throw another mars 600 in there as well and grow amnesia haze with my northern lights. I have good ventilation, will this be enough wattage or should I get some CFLs for under canopylight
Setup. Lighting
4y ago
2
3
Solved
MindFlowers68
Slight leaf tip "burn"
What do you think is causing this burn on my leaves? It seems to be quite common. and maybe nothing to worry about if it's this minute. but I would prefer to not burn my plants at all if possible. Could it be a sign of underwatering? Light distance? i have a dimmer keepin at 1000
Week 8
Leaves. Edges burnt
Leaves. Color - Yellow
Setup. Lighting
3y ago
4
3
Solved
Foxtrotoscar
Mars Hydro 1000W
Is the mars hydro 1000w enough for the three plants that I have growing as I have replaced the 2 other leds. Should I keep one in along side the mars or run it solo?
Week 9
Setup. Lighting
6y ago
2
1
Solved
MrIssa3x3
Do you lower light intensity and temps towards the end of flower?
So I’m in mid flower, start of week 7 to be exact. I’m curious on when you guys start pulling back light intensity and going with a little cooler temps. I’m running a 240W S33 from AC infinity in a 3x3. Should I be going strictly off of PAR or VPD at this point.
Setup. Lighting
2y ago
1
3
Solved
Rusticbuds
LED glass/plastic cover.
Glass/plastic cover on cheap led lights.. do you remove them or not? From keeping reptiles I know that any glass/plastic will reduce UV. Just wondering if anybody's noticed any difference after removing the glass.
Week 1
Other. General questions
Setup. Lighting
Setup. Other
6y ago
6
4
Solved
hollyhustler
I have several question about my setup for the first week:
- is the distance of the light to the plant ok? - is the intensity of 25% correct? - should I remove the seed coat or should I just let Mother Nature do it, eventually it will be blown up..
Week 1
Setup. Lighting
5y ago
3
3
Solved
Katalist
will seedlings survive with just natural light?
At the moment I dont have a growing light and all the babies get is sunlight (about 15hours). Will this be enough? They are sitting at the window with a humidifier to keep them moistyyy.
Week 1
Setup. Lighting
5y ago
4
6
Solved
SirTucksAlot
Too hot to trot?
Question; I’ve got 3 separate lights, but only running one at this moment . I tried all three just before and noticed a increase of smell from my plant.. Good sign bad sign? Noticed this in even the early stages in the vegetive state, but more concerned flowerin. Cheers community
Setup. Lighting
5y ago
2
3
Solved
Smoth313
Leafes curl up
Hey das sind meine Autos anfang Tag 6.Die blätter wölben sich leicht nach oben ist das normal/okay? oder ist das Lichtstress? Lampe ist eine AC Infinity Evo 4 300 watt hatte ich seit Tag auf 40% laufen und habe dann nach Tag 3 auf 30% reduziert. abstand habe ich 45cm.
Leaves. Curl up
Setup. Lighting
2y ago
4
3
Solved
Rush2112
45 watt Black Magic light?
I’m running a 45 watt led grow light. Instructions say to keep 2 inches from plant. Is this too close? Just don’t want to hurt plants. Thanks!
Setup. Lighting
6y ago
1
1