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
Ppfd?
2x2growing
started grow question 6y ago
What ppfd do you guys recommend for plants in veg? I’m finding that my light can be too strong at max power even at a 24” distance.
Solved
Week 6
Setup. Lighting
likes
HeavyHittah
answered grow question 6y ago
250 PPF for seedlings 400 to 600 for veg 600 to 850/900 in flower.
1 like
Complain
Selected By The Grower
GMSgrows
answered grow question 6y ago
Put your hand under the light at the height of your canopy., if your hand feels comfortable under the light for 1 minute then your girls will be fine. Cheers
2 likes
Complain
Similar Grow Questions
Solved
Vee_vee
Equipment necessary?
Can I grow an auto strain without a tent/lights etc.? Just in pot in my living room?
Setup. Lighting
5y ago
4
Solved
Dmelo
Viparspectra p1500 flower?
Anyone use a viparspectra p1500 during flowering? Got this as a cheap intro led and I feel like the plants stay in cottonball phase of flower...brought one outside and now its loaded with buds. Idk if this one has slow genetics or if the light isnt delivering correct spectrum
Buds. Other
Setup. Lighting
5y ago
3
3
Solved
Esoteric_growing
LED distance to plant advice
Interested in how close I can get my 630w LED with a rating of 2.7μmol/W and 1700 PPF to my canopy. I had it hung 48cm (19 inches) on 380w and just upped it to 500w day 8 in flower. Does this sound too close at 500w or is this ok? Temp is 25C (77F) humidity 55%.
Setup. Lighting
5y ago
2
Solved
Ronzo9
Full spectrum or all red grow light?
Hey guys! I have a Fast Eddy CBD autoflower grow on its 6th week and in full flower. I have been using a 150W UFO full spectrum light in a bucket, but I have another 150w UFO light that is all red. So my question is, would it help or make any difference if I changed it?
Setup. Strain - Autoflowering
Setup. Lighting
6y ago
3
4
Solved
2x2growing
Light burn or nutrient burn?
Hey guys. The tips of my leaves are starting to turn yellow and I’m wondering if this is a nutrient burn or light burn? I lowered my ppm feeding to about 250 a few days ago and am growing in ocean forest fox farm soil. And the light is an optic 2 running just the cobs at 24”.
Setup. Lighting
6y ago
2
1
Solved
fadagrow
Mars hydro Fc4800 hanging distance and power %
Hi, I see different advices on the hanging distance and power % for the marshydro fc4800 , any recommandation for each stages ? Thanks in advance for any advice from the FC4800 users will be really welcome 🤗. Thanks Fada
Setup. Lighting
4y ago
2
Solved
Growgodalex
Light time
How is she looking and how much light do you guys recommend?
Week 2
Setup. Lighting
6y ago
1
5
Solved
Jmaninthemidde420
Light intensity ? For bloom phase
When switching to bloom phase. Should I gradually increase the light intensity to 100% to help plants adjust or should I Immediately amp it to 100% This is a 500 + watt light by viparspectra (ks 5000)
Setup. Lighting
1y ago
1
5
Solved
Autogrowz
Small light/ big tent
I just upgraded tents. It’s a 4x4x7 foot tent. I have a Mars Hydro TS1000. I know that’s not enough for that tent. But I have a plant in its 2nd week of flower that out grew the last tent. Is it ok to just keep that light above that one plant in that size tent? Thanks!!
Setup. Lighting
6y ago
1
1
Solved
Mikewithgreenthumbs420
Hydro mars tsw 2000w got the complete tent set up and I was wonder if anybody else using this same led. when its sleep time after 18 hours running at 25 percent leds been off for 4 hours and I can still see lite power on under hood this normal or not how to fix doesn't seem right
Setup. Lighting
Setup. Other
5y ago
2
Solved
Cannabotix
When to increase light intensity for my autos?
I'm at the start of week 3 for my autos. When should I increase my light intensity and how much it's at 40% right now. It's a s24 ac infinity if that helps. Greatly appreciate the community helping me out this is my first adjustable light.
Setup. Lighting
3y ago
2
3
Solved
Insertcoin
Should i raise the lamp to force the strech?
I had the light the past few weeks 30cm over the plant on 100% wich has 930ppfd in 20h duration it was all together 65 DLI. I want to force the strech from now. Do you think i should raise the light up tp 50cm over the plant? The plant made nearly 20cm within the past weeks.
Week 5
Plant. Too short
Setup. Lighting
2y ago
6
1
Solved
Dr_Perl_Junior
Hey folks, newbie here! Any experiences upgrading the older model of Mars Hydro TSW 2000 with a custom controller/dimmer for Home Assistant integration? Insights appreciated! Thanks!
Setup. Lighting
Setup. Other
2y ago
4
2
Solved
GrowGirl419
This is my current grow. I have the 3, 4000w (or whatever) LEDss, does this looksound like enough light and in a decent position? I have several led small bulb lights I can place around if needed. What do you think?
Setup. Lighting
6y ago
2
5
Solved
Lew420
Bad idea?
Will a mars hydro TS1000 be too strong for a 60x60x140cm tent? I have been using a TS600 and TS1000 in tandem in a tent 4x too big for the light level, I have been growing strong and tasty buds but with low yields so downsizing my tent size to maximise the light.
Other. General questions
Setup. Lighting
2y ago
3
2
Solved
Smokin_Joe
Light flashed on
Our power did some interesting things during the storm & the lights went on in the tent - I would say they literally flashed on & then off (along with the rest of the house) - during the *dark* period. How concerned if at all should I be about this? Anything I should / could do?
Setup. Lighting
5y ago
1
1
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
Vegas_Kind_Budz
Hey guys! Two big newbie questions here!
When should I start adding my nutrients? And when should I switch to using my 500 W LED light.The plants are about nine days old, and I'm going to use Cal-mag with Flora trio.Currently using pH balanced water, and currently using a 72 W light since germination. Time for 2nd Gear?
Plant. Other
Setup. Lighting
6y ago
5
5
Solved
Growvanced
Throw out one plant?
Is it productive to kill one plant if the rest of the plants are filling out the room just fine and to promote ventilation and light penetration? I have one plant that is way shorter and behind the others due to genetic problems.
Setup. Lighting
Setup. Ventilation
6y ago
1
3
Solved
GrowwUp
When turn on the lights?
It's pretty warm here right now already. When is the right moment to turn the light on? It's a dual spectrum 300w CFL under a 470x470 reflector and both seedlings are auto fem. What's the best light schedule? 24/0? 18/6? Thanks
Setup. Lighting
5y ago
2
2