Not this run and not at the moment it’s really bad for your eyes... Slowly burning out my corneas over the years I don’t wear sunglasses enough in there
I want to vertically hang a MH/HPS bulb in my tent in the middle of my plants at plant base height
- Thread starter rtaym2224
- Start date
your 760 watt light only needs 1528 btu cooling while running so a small exhaust fan directly over the light would be fine. i'm thinking something like this:
https://www.homedepot.com/s/duct%20fans?NCNI-5
i linked all of them because the page is hilarious, but the little 4" will probably be enough for that size space. i have been running these things for years and they are very reliable.
i found the page funny as they show the same fans for hvac, growrooms, and tents! looks like they're finally figuring out the market.
so, basically, you have 2 choices, sealed or open. each presents challenges. if you run an exhaust fan what happens when your garage gets cold. will a little heater offset your winter conditions?
to be perfectly honest, i have been a stealth, black-market grower for most of my 25 year career.
i have become adept at modifying household heating and cooling systems to make all kinds of weird situations work.
if you do hook up the ac you will have to run co2.
i used to be religiously addicted to co2 supplementation but a house with people and pets can produce significant co2.
it is consumed on a per unit basis so as long as you don't let the co2 level fall below about 400 ppm you'll be fine.
your house has a system installed already. is the house attached? if not, forget all this but if it is you can easily run a small duct like a 4" flexible one.
i have crawled under a rental house and connected an 8" flex duct to the main duct using the right gear so that later if anyone finds it they will think it's been there a while. then ran it through a wall and hidden in the garage by a cabinet that was next to the grow room. this was a 10x30 ft room with ten huge trees and hps lights dropped between them.
https://www.homedepot.com/s/duct%20fans?NCNI-5
i linked all of them because the page is hilarious, but the little 4" will probably be enough for that size space. i have been running these things for years and they are very reliable.
i found the page funny as they show the same fans for hvac, growrooms, and tents! looks like they're finally figuring out the market.
so, basically, you have 2 choices, sealed or open. each presents challenges. if you run an exhaust fan what happens when your garage gets cold. will a little heater offset your winter conditions?
to be perfectly honest, i have been a stealth, black-market grower for most of my 25 year career.
i have become adept at modifying household heating and cooling systems to make all kinds of weird situations work.
if you do hook up the ac you will have to run co2.
i used to be religiously addicted to co2 supplementation but a house with people and pets can produce significant co2.
it is consumed on a per unit basis so as long as you don't let the co2 level fall below about 400 ppm you'll be fine.
your house has a system installed already. is the house attached? if not, forget all this but if it is you can easily run a small duct like a 4" flexible one.
i have crawled under a rental house and connected an 8" flex duct to the main duct using the right gear so that later if anyone finds it they will think it's been there a while. then ran it through a wall and hidden in the garage by a cabinet that was next to the grow room. this was a 10x30 ft room with ten huge trees and hps lights dropped between them.
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If worried about heat Id put it in a cool tube and extract air straight up the tube, Im thinking about doing it myself I run 8 plants in a 10x10 and have room for a verticle light when I push them out from the center, mine are on little trolleys with a draining tray and net over the plant so they are self-contained so I can move them around the room.
Three Berries
Active member
HID lighting is energy in a plasma state and the same as looking at the sun.
Three Berries
Active member
Those inline fan are quite inefficient when compared to variable speed EC motor axial fans.
There are swamp coolers that also add humidification, some easy to make if you have skills.. Peltier coolers too but they get expensive.
I would like to use water myself somehow.
There are swamp coolers that also add humidification, some easy to make if you have skills.. Peltier coolers too but they get expensive.
I would like to use water myself somehow.
Switcher56
Comfortably numb!
You can also throttle your exhaust fan during lights out... or buy an Infinity fan that will do it automatically based on temp. The Q is, what are you trying to achieve? Deal with the issue vice trying to combine things that never really fix anything. IOW you are chasing your tail. You can have drop down lights, they don't have to be HPS/CMH (which run hot). You need to control the temp not the luminosity, in order to affect the tent temp. Besides, the glow of HPS/CMH (read heat) that close to the plants might be detrimental. It is akin as having your plants to close to the light.
Three Berries
Active member
If the temps are too high it really takes a lot of air flow to bring it down. Air isn't that good of a thermal sink. You end up really lowering the humidity. In tents anyway. A open room would be easier to manage I would guess.
But you can us the humidity to help out as the more humid the air the more heat it can hold as the water vapor expands more than the air and increase percentage wise. So the exhausting becomes more efficient with less air flow.
But you can us the humidity to help out as the more humid the air the more heat it can hold as the water vapor expands more than the air and increase percentage wise. So the exhausting becomes more efficient with less air flow.
dlxtpnuo
Active member
Hi fellow cannabis enthusiast. Working with MH & HPS requires a great deal of experience. I personally do not agree with the dangerous concept of grow tents with MH & HPS. When this was a new consumer concept around the millenium (2000), things like water cooled lamp housings for MH & HPS lights extracted the heat making so-called MH & HPS tent grow ops viable. Since then the media and home growop supply businesses have continually dummed-down the many dangers like the intense heat and high voltages.
LED's on the other hand are fairly safe and simple in comparison. In short MH & HPS produce intense heat, and typically need many metres of clearance depending on the wattage. Any item too near will simply heat up and combust. LED's on the other hand are fairly cool, with only basic precautions required, and a tent for LED's should be fine.
It is going to cost a lot more to recover the damage caused by a MH & HPS fire. Even the inevitable damage caused to cannabis vegetation by mistakes with the intense heat is not recoverable and your seeds plus much work will be wasted. So why not invest in LED's. An investment in LED's now could save money in the long term, whilst virtually guaranteeing a cannabis crop. Plenty of second hand LED's are being sold on websites like Ebay for small amounts of money. Many are fully integrated, very reliable and are great lights to use. On Ebay use search words: LED GROW LIGHTS, (VIPARSPECTRA) (in hydroponics).
Here's a quick look at the realities the intense heat of MH & HPS can cause.
Firefighters battling a Cambs house fire discover it's a cannabis factory
The fire started in a room with cannabis plants (Image: Cambridgeshire Police)
A fire at a cannabis-producing house in Cambridgeshire could have had ‘devastating’ results, police said today (June 22 2021).
The fire service was called to a house fire in Little Downham, East Cambridgeshire on Sunday, June 20.
While extinguishing the flames in a bedroom on Lawn Lane, they discovered the house was being used to produce cannabis on a large scale, and alerted police.
A 55-year-old man was arrested on suspicion of cultivating cannabis, after around 40 plants and growing equipment were seized.
A drug-growing operation was discovered inside the house (Image: Cambridgeshire Police)
He has since been released under investigation.
Cambridgeshire Police said: “Some might think it’s 'only a plant' but drug dealing and cultivation can have a devastating impact on communities, and this cannabis factory in Little Downham nearly caused a devastating fire”.
Photos from the scene on Sunday show damage caused to a first-floor room containing cannabis plants, with many more being farmed in other parts of the house.
Sharing the incident on social media, the force directed people to report any suspicions of drugs being grown in a nearby property, through the constabulary’s website.
Cambridgeshire Fire & Rescue Service has been contacted for comment.
Link to this 100% genuine news article: https://www.cambridge-news.co.uk/news/local-news/firefighters-battling-cambs-house-fire-20878012
I just hung a 600 vertical last night and now I cant look anywhere without getting blinded by it, seems a peak hat wont cut the light now, the added vertical looks to have made a big difference in whats lit up, it will probably contribute to yield more than any light in the room, first time Ive had vertical and will be interesting to see the result.
this image is a stock photo appearing in literally hundreds of unrelated articles:
https://www.google.com/search?tbs=s...WUKCfA4HhDy0wN6BAgBEEE&biw=1366&bih=625&dpr=1
further, although there was a house fire in cambridge, uk in a house that contained cannabis, there is absolutely no mention whatsoever of the cause and nowhere is there a suggestion that hid bulbs were responsible for it.
it was most likely overloaded circuits caused by the cannabis grow but that is a lot different than inferring hid bulbs caused the fire.
also, bringing this kind of "fake" public safety article to icmag is so ludicrous. do you think you are talking to teenagers trying to grow in their mom's closet?
this is the most prestigious cannabis mag on the web today and it is full of world-class growers.
these kinds of articles are bad for cannabis. tell the truth!
i want to add that this entire article written by dlxpnuo appears to be an attempt to sell led lights. i wonder if he is a vendor?
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Switcher56
Comfortably numb!
Well that was a waste of time and energy. Whatever floats your boat I guess. 
Cerathule
Well-known member
Nice, what other lights are in there? You mind sharing a pic?
I think it's good advice to always put some glasses on when opening a tent or growroom, also the LEDs will emit a high irradiance. Our eyes quickly throttle that down but that doesn't make it less heavy on some of our eyes tissue.
Going Vertical is the same deal...stay out of there when its on
Use T-5 as "worklights"
www.iluminarlighting.com
hydrobuilder.com
hydrobuilder.com
Use T-5 as "worklights"
Vertical DE Reflector | ILUMINAR Lighting
Introducing the 1st of its kind - Vertical DE grow light. Vertical grow lighting provides solutions for growers with limited plant counts. Learn more...
www.iluminarlighting.com
Sun System 315 Watt LEC Vertical Hanging Grow Light Kit
Buy the Sun System 315 Watt LEC Vertical Hanging Grow Light Kit at Hydrobuilder.com. Shop the entire line of Sun System products along with thousands of hydroponics supplies on sale now.
hydrobuilder.com
Phantom 315 Watt CMH Vertical Hanging Grow Light Kit
Buy the Phantom 315 Watt CMH Vertical Hanging Grow Light Kit at Hydrobuilder.com. Shop the entire line of Phantom products along with thousands of hydroponics supplies on sale now.
hydrobuilder.com
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The 315s have the extra layer of tempered glass that regular MH/ HPS does not
Which may or may not offer any real protection from heat induced fire risk
If ever in doubt ... have an electrician look into it...Electricians get high too!
Its an overload of the panel somehow And probably not a light bulb causing fires
Its all UL stuff these days
Dont overload your tent with wattage!
Which may or may not offer any real protection from heat induced fire risk
If ever in doubt ... have an electrician look into it...Electricians get high too!
Its an overload of the panel somehow And probably not a light bulb causing fires
Its all UL stuff these days
Dont overload your tent with wattage!
joemeetmary
Member
There's some really great threads in the ol vert section. Besides Marlo, Ichabod is full of vert knowledge.
He switched to led panels here, but really in depth knowledge on vertical growing.
And @DHF is a treasure trove of bare bulb lessons.
I kept looking for dimmable 315 CMH with remote ballasts for my setup, but couldn't find any. Ran 2 stacked 315's in a 3x4 footprint with 7' ceilings. Heat was a bit much in summer, so switched the bottom bulb to a corn cob led. Really helped with heat and was easier on my eyes.
I ran a dimmable 400 hps in a pretty small space for a couple years. In certain situations, vert is the way to go
LED vertical scrog
I thought I would start a new thread on vertical scrog. I will be using LEDs to light it. Here is a picture of one of my scrogs done with LEDs. Here is why I do vertical scrogs. First is plant limits. I only have so many plants that I can run so I run big plants. I dont flower them...
www.icmag.com
And @DHF is a treasure trove of bare bulb lessons.
I kept looking for dimmable 315 CMH with remote ballasts for my setup, but couldn't find any. Ran 2 stacked 315's in a 3x4 footprint with 7' ceilings. Heat was a bit much in summer, so switched the bottom bulb to a corn cob led. Really helped with heat and was easier on my eyes.
I ran a dimmable 400 hps in a pretty small space for a couple years. In certain situations, vert is the way to go
