The Grow Awards 2026 🏆
Start My Diary
Start My Diary
Login
Start My Diary
Home
Diaries
Strains
Shorts
Questions
Contests
Growers
Seeds
Breeders
Nutrients
Equipment
Blog
Login
Sign Up
Following
Follow
Brands
&
Growers
to get updates
Back to Grow Questions
Optimal Veg Light Spectrum?
BlumenBot
started grow question 5y 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 5y 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 5y ago
I have a veg only—- 4500k. 4000 would be good! ✌️🏻💚🌿
likes
Complain
Crawlndog
answered grow question 5y ago
Personally, I would use 3100K-4000K for Veg... would never go below 3000k
likes
Complain
Similar Grow Questions
Solved
topplant
LED Suggestions
Can someone help suggest a decent grow LED for a space of 0.3m with height of 1m. Looking to only grow 1 plant on a budget.
Setup. Lighting
3y ago
3
5
Solved
BullWeedDog
Pasar de fase de crecimiento a pre-floración??
Cuando las plantas pasan de estar en la fase de crecimiento a pre-floración?? Es que la tabla de los fertilizantes que tengo (grotek) muestra estas fase pero no se cuando se hace el cambio y en esta fase es cuando subo de potencia el balastro de 400 a 600??
Other. General questions
Setup. Lighting
Techniques. 12-12 from seeds
3y ago
1
1
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
Foggedaboudit
Hi first time grower here. Been vegging 4 plants in 80cmx80x160 tent with 150W LED (Mars Hydro TS1000). Start of 2nd week flower today and I added another 150W LED. Could that potentially increase my yield? Thanks!
Setup. Lighting
3y ago
3
5
Solved
potfromgreece
Led bulb 54watt in total
Is 6x9w led bulbs(2700k from Leroy Merlin) is enough to grow a plant? 54w in total.
Setup. Lighting
5y ago
4
Solved
Fletchy
Seedling light height?
My marshydro tsw2000 is set to 100% how far should it be above seedlings? Currently 50cm / 20inch
Week 1
Setup. Lighting
3y ago
2
Solved
CaninhaSativa
regarding the light spectrum ratio. what is the ideal light spectrum for both the vegetative and flowering phases? Do you use 3500K lights during the vegetative stage, or only use cold white lights at 6000K? do you then switch in flower to 3500K lights along with 370-780nm?
Setup. Lighting
1y ago
6
2
Solved
slothasor
Light proof during veg?
Hey! If I am doing a 18/6 veg light cycle... Does it need to be completely light free during the 6 hours or will light leaks still cause hermie's like in flowering? Thanks!
Setup. Lighting
5y ago
3
Solved
NonameGrowDude
Seedling / veg light suggestion
Looking for Led veg light for a small space that I would like to use to start my seedling and to veg for 1 week or 2 before I move the plants in to my grow tent.The space is 40x80x80cm. Any suggestions?
Setup. Lighting
2y ago
8
Solved
Hou_Stone
a good lamp ?
Good morning, Currently I have an hps and I'm looking to invest in a good lamp. Do you have a good one to recommend? I have a room 100x100x200 cm Currently I want to take the mars hydro fc3000 I am not sure if it is powerful enough for my room? I would like to have opinions
Setup. Lighting
3y ago
4
6
Solved
StDeacon
What do tent do too small?
The plants are getting too big for the tent and I don't know exactly how to make the lamps even higher or somehow got the plants bent down, has anyone given me some advice or can help me?
Setup. Lighting
4y ago
1
5
Solved
JTrim
Is closer to the light much better?
Is the light closer better? I have a VIPARSPECTRA 1000W LED Grow Light (10W LED ,x100) and it says during veg 18-26 and flowering distance at 18-24”. Looking at other growers using LED they are closer. Should I try to keep it closer a little at a time? Is there benefit?
Setup. Lighting
5y ago
1
1
Solved
GrowwUp
Mars TSL 2000 doubt
I just installed my new Mars TSL 2000 and noticed that some of the IR LEDs are more faded than the others. Is it normal in LED lights? Also the LEDs distribution is different than the advertised. Ripped off or just a different model?
Setup. Lighting
4y ago
2
3
Solved
UKgrowerNCL
Can anyone identify this LED light I am using, a friend gave me it and i was just curious of the brand. If you need more pictures feel free to ask 😁✌️ Thanks happy growing.
Week 1
Setup. Lighting
6y ago
1
2
Solved
zkittlezjunior
Lumen and watt in microgrow
What is the important light thing when u go micro grow ? Im gonna grow it in pc case or something like that.In a small cabinet.How many watt and how many lumen do i need for it?Im gonna use Cob Led full spectrum and autoflowering seeds.For example 100w and 80lm/w light is enough?
Setup. Lighting
6y ago
5
Solved
gruenerdaumen
Blüte einleiten
Wie soll ich den Lichtzyklus ändern von 16/8 auf 12/12, einfach direkt in einem Tag 4 Stunden Licht wegnehmen oder step by step pro Tag 30 min weniger Licht geben, bin mir unsicher ob ein direkter wechsel zu Zwittern führen kann, wie macht ihr es?
Setup. Lighting
1y ago
3
Solved
Goldenbags
Contemplating putting 2 plants outside. I have 8 in a 3x3 with Mars hydro tsw2000. It’s pretty tight in there. What do you guys think? Is 8 too many for the size and light? Or should I just leave them as is? I think the the pots are 3 possibly 5 gallon.
Week 4
Setup. Lighting
3y ago
8
8
Solved
bobo66
Will changing hps to led cause problems for my growth?
I would change from 400w HPS to 215w(x2)sanlight gen1 led, I will enter at 4 weeks of flowering. won't it disturb the plants if I change the light? (4x4 tent.(
Setup. Lighting
3y ago
3
4
Solved
HierroYOlivia
Some economic but good led for 120x120?
Week 1
Setup. Lighting
6y ago
4
3
Solved
Sillystoat
Lighting schedule?
Many references state the when moving from vegetative to flowering stage the lighting schedule (indoors) needs to be reduced from 18-20 hours down to no more than 12. Why do many here stay at 18 or more the whole way through?
Setup. Lighting
5y ago
1
3