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
Hydronaut
Longer Light Cycle - Mid Bloom
Is changing the light cycle of an autoflower from 18/6 to 20/4 in mid flower too stressful? Doing so would bump my DLI enough to keep my existing light through harvest. She sleeps like clockwork but less so now in mid flower. Will she adjust in a couple days to a longer day?
Week 8
Setup. Lighting
4y ago
2
1
Solved
Jmaninthemidde420
Can you use a 450 watt white led light to start seedlings? If so what distance should the light be and when should I make it closer? The reason I am asking this is because I don’t like transplanting autos as they are fragile to transplanting from what I’ve looked up
Setup. Lighting
4y ago
1
1
Solved
EJBudz
Changing Lighting Schedule
The days on the plants are since planting, so i was going to keep the vegetative light schedule until 5 weeks since planting, then start moving towards a 12/12. Is it even optimal for an autoflower to have a traditional 12/12 lighting schedule during flowering?
Week 4
Setup. Lighting
3y ago
4
5
Solved
Peweez
Connecting 2 SANlight evo 3-100 with AC Infinity Controller 69 PRO
Hi guys, I want to connect 2x SANlight 3-100 1.5 with AC Infinity Controller 69 PRO. I searched on the internet and found that i'll need this sanlight Trolmaster RJ12 cable and this AC Infinity UIS Type-A RJ11/12 0-10V Dimmer. Do I need this stuff for each lamp or can i combine?
Setup. Sensors
Setup. Lighting
1y ago
2
3
Solved
420Highlifecouple
Auto flower in flower light cycle?
Do I switch my AUTOFLOWER to 12/12 in flowering?Or 18/4, 20/4 from start to finish?
Setup. Lighting
4y ago
3
Solved
Killab1405
Light distance and intensity
I have a marshydro tsl2000. What distance and intensity should I have for these five darlings? Don't they look wonderful?
Setup. Lighting
5y ago
1
1
Solved
marihoochi
Required and Type of Wattage
Switching to 12/12 tonight. Currently using 2 - Spider Farmer sf4000's; need more light for flower period; Should I use a 3rd Spider Farmer 4000 or a 1000W dimmable HPS for maximum THC, Taste and Yield? The SF4000 uses 453W 12 X 6 Flower Area
Week 8
Setup. Lighting
6y ago
3
3
Solved
Fayah_Burn
Grow Light Advice
Helloo growmies! I've got a question.. I need a new light for vegging (only) in a 80x80cm tent. I am thinking of eather the LIGHTWAVE T5HO 60 CM (48W) or MarsHydro TS 600 (100W) Has some one experience with those lights? Is it worth spending double on electricity with the MH?
Setup. Lighting
4y ago
7
10
Solved
Growladyeastmidlands
Maxibright 200w led
I just brought a maxibright 200w daylight led and I popped some seeds yesterday. Today I have put them under the led light set at 20% will this be OK for them please Also is the maxibright 200w a good led light thanks
Setup. Lighting
4y ago
1
Solved
Tri_Op
Grams per watt
What’s the best gm per watt that someone here has gotten on a single plant? I’m aiming for 1gm per watt but doubt that she will yield 315gm once dried.
Week 10
Setup. Lighting
6y ago
2
2
Solved
StDeacon
How much gram at 300 watt?
How much gramm does mine get from a plant when working with 300 watts full specktrum LED? Have I read the 1 gram per 1 watt is that true?
Setup. Lighting
6y ago
2
Solved
m0use
LED Kelvin Temp 3000k-6500k
Is there a massive difference in colour temperature/kelvin of LED's if the lumens, PAR, watts, intensity and every other aspect you can think of is the same but its temp/kelvin is lower? I use a 6500k LEDs, may mix in or switch to 3000K for better flowers if its proven to work.
Week 10
Other. General questions
Other. Other
Setup. Lighting
6y ago
5
3
Solved
GrimReefer88
Lunar 600w led
I am doing my first grow and I am useing a lunar 600w led light ,has anyone used them before and are they any good ?
Setup. Lighting
6y ago
1
2
Solved
nyalexas
Lamp distance
Does my lamp need to be further away?
Week 5
Setup. Lighting
6y ago
1
4
Solved
MrJoint
Distância e potência do Led
Para a fase de mudas: A potência do Led em 25% (mars hydro TS1000) e distância de 60cm da planta estão adequados ou posso diminuir a distância para um melhor crescimento nessa fase??
Week 2
Setup. Lighting
5y ago
3
Solved
Purple2by4
Switching from led to hps for flower?
Howdy, does anyone switch from a blurple led board for veg, to a hps or similar style light for flower? Why, why not? Is it worth the little extra hassle to buy and install? I like my led just fine, but wondering if there’s more to be gained in flavor, quality & yield. Thanks!
Setup. Lighting
5y ago
5
2
Solved
SmokinJuan
Is My LED Strong Enough To Grow And Bud 2 Plants?
Hey guys, I'm currently growing 2 plants under a 600w LED... I think it's actually closer to 100w. I'm getting about 20k lux from 10inches away... Do I need another more powerful light for flowering? Help please it's my first grow XD
Setup. Lighting
6y ago
5
4
Solved
Luluboo80
Auto seedlings, lighting question!
Hi! I have a question. I am just about to start my first indoor grow, it’s relatively small, only two plants, both autos. I am using the Telos 6 mesh LED for lighting but I am unclear as to when to switch the power from 25-50%? Is it when the first true leaves appear? Thanks
Setup. Lighting
Setup. Seedling
2y ago
2
2
Solved
Madmike88
Switching light schedule
Can I turn my lights on 24hrs (currently 19 on 5 off) for the next week and then switch them back? (In week 4 of veg). Currently in a 3x3x5 tent with a light and heater and the vent open. The 5x5x7 I have is in my garage, no room in the house and 6 plants total
Setup. Lighting
5y ago
1
2
Solved
Raining
SpiderFarmer
How far should I hang my SE-5000? Without having a par meter it's fiddling with it too much, I want to set and forget, Also, Does the veg seem slow for 3 weeks. Cheers
Week 3
Setup. Lighting
4y ago
6
4