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Back to Grow Questions
MH, HPS distance?
Untiedmymind
started grow question 5y ago
So i am reading diaries that are using MH & HPS lights and Seeing a Distance of 10-18 inches from plant. Are people really putting them that close during flowering stage?
Open
Setup. Lighting
likes
Answer
youngatheart
answered grow question 5y ago
Apparently so. I consider it f.... cruel.
1 like
Complain
Similar Grow Questions
Solved
GeminiCQC
Help with issues ID
I have a photoperiod in a 5 gal using BAS light. It is currently day 3 of week 4 , and I'm getting some damage on the tops. Would this be light stress or another issue? The tips are starting to go light green. Using the 200 watt light for the 2x4x8 ac infinity tent.
Leaves. Tips · Burnt
Setup. Strains · Photoperiod
Setup. Lighting
2y ago
2
Solved
eatmykimchi
hlg550 distance from canopy veg
How far from canopy for HLG 550 during each stage? After starting with a cheap LED, without getting a par meter I think 18" @ 50% power, or 32" @ full power for veg? Start higher and increase power every few days?
Week 1
Setup. Lighting
6y ago
1
3
Solved
NorthernStar20
Switching to bloom nutes and photoperiod changes?
When should I start giving bloom nutrients and stopping the veg nutrients? Also can I switch my light cycle to 24hrs to increase the temps and maximise my yield? Or will this mess with the plants?
Week 4
Setup. Lighting
Feeding. Schedule
6y ago
4
3
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
6y ago
1
2
Solved
AirDuster
Very technical question - LED wattage vs actual power used
My LED is a Phlizon 600w but the power draw is only around 97w at the plug. Perhaps a silly question, but is my diary entry supposed to be 600w or 97w? Looking at other diaries, it looks like yield is expressed as weight/watt and want to be consistent.
Other. Other
Setup. Lighting
6y ago
1
2
Solved
Kershaw1231
Does she need more light ?
Does my plant need more light she is under a 300 watt light I do have a spare do I need to put it to use ? She seems to be growing a Lititle slow for 2nd or 3rd week I am using advanced nutrients grow, micro, bloom any help would be great this is my 1st grow thanks
Other. General questions
Plant. Other
Setup. Lighting
5y ago
1
4
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
Mel_Macallan
Hi, can anyone tell me if it's normal, or why those lower branches are stretching so much? I have only one 50w cob light. Which apparently produces equivalent to 150watt... Is that enough? I have only one plant and a very small grow box. Thanks for any advise :)
Setup. Lighting
6y ago
4
Solved
WeedBerry
Hi im just wondering if the height is good enough for my plant if not what is the recommended height and lux level. The light is from ebay it says it gives ofd 1200w to the plant but acutely takes like 15 - 20w the light i got is the 3rd row on the pictures
Setup. Lighting
6y ago
1
1
Solved
Student_of_Science
Trying to get setup right
I know I prob need to get a nicer light and ditch all the crap lights but for now I have what I have. Perhaps after some success I may be able to get a new light to replace all of them. But how far should it be? 2 feet above rockwool cube? And what watts per plant
Setup. Lighting
4y ago
2
2
Solved
Kayaboy
Downgrade my light wattage or not?
My tent is 80cm x 80cm x 180cm and i use a 400w hps/mh. Based on all light calculations i came across it gives me a total requirements of light of around 160-200 watts. Should i downgrade to a 250w system or keep the 400w and why please, some expert ? Thx
Setup. Lighting
6y ago
2
2
Solved
GrowerLacey
Change light schedule
My babies are now in 8wks, the light schedule is 17:7. I have scheduled the 8hrs sleep frm 5am-12pm (this is my sleep time) and now that I hve changed my sleep time, I would like to change their sleep time too, from 10pm to 5am. How will I change the light without stressing them?
Setup. Lighting
4y ago
1
Solved
TheGourmetWeed
Worths investing?
Thinking to upgrade my grow with 4 x 15w led bars. 1 on each corner of the grow room, vertically, as secondary lighting to a 400w hps. Does it worth the investment? Price vs yield?
Setup. Lighting
6y ago
2
3
Solved
Cc4mo
Colour lighting
Thanks to eveyone that replied to my last question, really means a lot! Another quick question about lighting I had was if I should have blue light for veg then red for flower or just have the mixed purple on for the duration of the plants life?
Setup. Lighting
4y ago
2
1
Solved
Rene1968
Avg PPFD
What do you think about my PPFD at this veg. Periode? Look at picture
Week 5
Other. Other
Setup. Lighting
4y ago
6
3
Solved
GrimReefer01
3000 watt power use
This is my first time using such a powerful light in my opinion, 3000 watts seems overkill but that's what i want. The question IS, is it better to have 1-2 plants under the 3000 watt or worth it to manage 4 at a higher distance? Cheers. Don't keep techniques in mind.
Setup. Lighting
6y ago
2
1
Solved
Nivloc
First grow. Growing autos from meph in a 3x3 tent. They are in the w/3 of flower. On 24 hr light.(Accidentally) having a heat wave in my area and can't keeps temps down below 80-85. Will it hurt anything to switch to 18/6 now so I can have lights off when it's hottest part of day
Buds. Other
Setup. Lighting
2y ago
7
5
Solved
LegalGrowMyOwn
experienced growers are in demand😵💫💡
Hey volks 🙌 I'm trying to grow 3 different grow phases in my 4x4 tent, but getting too much problems with my light.(Mars Hydro TSW 2000) its too strong for my little plants. Can you give me same advice about hight/intensity? Thanks alot and happy growing🌱
Leaves. Tips · Burnt
Setup. Lighting
2y ago
2
3
Solved
4EverGreen
New to Indoors-Lighting Question
First time growing indoors. I purchased a Mars hydro TSW2000 but the manual has no information…. It’s equipped with a dimmer but I have no clue on what the appropriate height & dimmer setting should be for seedlings or the height for the veg period & flowering period. Advice plea
Setup. Lighting
4y ago
3
3
Solved
Frezzy
Growlampe
Hello everyone, I've been looking for a good grow light that can handle multiple plants without any issues. I've heard a lot of good things about the Mars Hydro TS600. Is the light better for single plants, or can you also grow multiple?
Setup. Lighting
2y ago
3
3