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
Light height
GermanGrows
started grow question 4y ago
Hello all I have a mars hydro tsw 2000. I was noticing the recommended height is 24 inches for seedlings. Is this at 100% intensity? That's well over 1000 ppfd by my meter. I thought seedlings could only handle 200-400?
Solved
Setup. Lighting
likes
DawgHaus
answered grow question 4y ago
Hang it at 24 inches and power at 25% 👍 don’t need to turn up to 100% until your into flower. Good luck 💪
likes
Complain
Selected By The Grower
Similar Grow Questions
Solved
Shags212
Best Price to Performance LED growlight
Looking at buying another LED growlight for my flower tent and want to know what one is the best price to performance wise. but I want it to better the one I have already. Wakyme 1200w (210w) 120 LEDs x10w was £65 from amazon. To cover 4 to 5 plants at most
Setup. Lighting
5y ago
3
2
Solved
TheBonnieRobin
How to tell if light is damaging plant?
I'm using a Mars Hydro Ts600. Manufacturers advice is to keep height at 12'' minimum above the canopy in flower but other growers report it can hang as low as 10''. In identifying optimum height how would I be able to tell if it was too low for my plants? What should Iook for?
Week 8
Setup. Lighting
5y ago
3
3
Solved
Noahbear
Are my leaves light stressed?
Are my leaves getting too much light? They seem light stresses. Any input would be great- thanks
Leaves. Color - Yellow
Setup. Lighting
4y ago
3
2
Solved
iopiopiop
Lights
I have 3 weeks of flowering left over and Id like your guys opinion. Do I leave my plant under the sun for 8hrs (max direct sunlight time) a day or do I keep it under a 6500k 150w Growlight? (For the whole day)
Week 11
Setup. Lighting
5y ago
1
1
Solved
Pupper
What’s the ideal amount of LED light for top quality in a 4x4 tent.
I’m exclusively looking to grow top end quality. Already can with HPS setup but wanting to switch. Is 480w Kingbrite LED quantum board with 385,660,730nm enough for this or do I need more? Any other suggestions? Aliexpress/Alibaba manufacturers preferred due to shipping costs.
Setup. Lighting
4y ago
4
4
Solved
BrainStorm22
Problem with the lamp
I have a problem with a new lamp of haluro this turn on for 10 second then this turn of
Setup. Lighting
5y ago
3
3
Solved
BENY_TRUBY
Espectro de luz en automáticas
¿Cuándo se debe cambiar la bombilla de crecimiento a floración? Tengo unas autos de exterior a las cuales les doy iluminación extra dentro de casa cuando es de noche. Los focos son neones CFL de 55w y hasta ahora (5 semanas) siempre he usado el CFL con espectro para crecimiento.
Setup. Lighting
3y ago
2
Solved
AUTOASSASSIN215
Is my 1000 watt led To far from my plants New 8foot tent ??
NEW TENT 8 FOOTER MY PLANTS ARE LIKE 6 weeks IS THE LIGHT TO FAR AWAY 1000 watt led ???? Took a measurement using my phone
Setup. Lighting
5y ago
2
3
Solved
LeroyDagobert91
Can i add a light to help flowering
can i add a light to help flowering even if it is a 6500k one i noticed that my actual 2700k led light is less powerful that the one i used for vegetative phase can i add (with the 2700k one) it even if it is a 6500k one ?? will it slow down the flowering ? thanks !
Setup. Strain - Autoflowering
Setup. Lighting
3y ago
2
3
Solved
AlpineGoat
Low budget light
I don't know if this is the right light. I'm gonna leave it for a week but if I don't see any kind of growth I'm gonna replace it with some good light. But since it's a wooden box I don't want to put a big light, maybe some stripe or bars, any low-budget suggestion is appreciated
Week 2
Setup. Lighting
5y ago
4
6
Solved
Stegogrow
Changing led lamp after 8 days of growth? 300wto1000w
Can I start gémination and first days of flowering with 300w niello and then change to a 1000w which still has to arrive to my home?
Setup. Lighting
3y ago
1
6
Solved
KCduzit
Plug timer running fast
My plug timeris running about 10 fast each 24hr. And is now at about 2 hours past the actual time. This causes the light cycle to shift forward slightly everyday. Should I set it back to the correct time, leave it be or buy a new one? It is plugged vertically in wall socket.
Week 4
Setup. Lighting
5y ago
1
2
Solved
Smoqer
Veg Bloom switch
What’s the best moment to switch to veg and bloom if using a full spectrum led?
Week 5
Setup. Lighting
5y ago
4
3
Solved
dauntless
78,600 lumens at canopy, ok for pre-flower and flowering?
I have recently received a lumen meter. Measuring 78,600 lumen over canopy, is that OK? For my other grow, does anyone know how many lumens seedlings need (at about 25000 now) ? I can convert from PPFD or PAR. Educate me! Thanks
Week 7
Setup. Lighting
5y ago
1
1
Solved
DoomSmoker
2x2x4 yield expectations?
I want to use a 2x2x4 tent, growing (Gorilla Cookies) autos in Nature Living super soil mixed with Coco Loco. I want to yield just a few high quality ounces. Is this easily achievable with one 3 gallon pot under a SF-1000? Should I be concerned with any plant height issues?
Setup. Strain - Autoflowering
Setup. Lighting
Setup. Other
4y ago
2
4
Solved
NonameGrowDude
Led light for a small seedling / early veg space 80x40x80cm
The plants to use the space to start seeds and veg them little bit until I transplant to final pot in a flower tent. I don't have much height so is looking for a light that the plants can be close to. Any suggestion for led or should I just go with t5?
Setup. Lighting
3y ago
2
Solved
Capo420
Lighting Change
Okay, I feel like I am asking a lot of questions so let me apologize for that. Lol. So my plants just seem to be behind most people's I see on here.Is it too late to change my lighting schedule? My theory was northern hemisphere gets many days 24hr lighting. Good or Bad?
Setup. Lighting
4y ago
1
1
Solved
DennM39
Light distance from canopy
My 4x8 tent has two 2000watt led lights in it .. what’s a good distance to keep my lights above the canopy ?
Setup. Lighting
4y ago
1
1
Solved
yokotasan
Booster light did not turn off during night time
6th week of flowering AUTOFLOWERS 20/4 I accidentally left 20w 600mn booster for 3h during dark period (I noticed as switched off) Will they hermy? To be honest my growbox has holes so it was never a total balckness.
Setup. Lighting
1y ago
6
5
Solved
Siriuz
Should I take her outdoors for 3/4 hrs daily ?
They've got 53 days outdoors morning time and when the weather is good they used to stay outside all day til 6pm then back indoors until next morning at the AC comfort zone plus CFL 150 watts, now they have 600 watts LED Grow lights and no outdoors plus 100 CFL lights fan and AC
Week 8
Other. General questions
Setup. Lighting
5y ago
2
3