hello and welcome to the Migro Youtube channel my name is Shane and I'm the

founder of Migro in this video we're going to look at what are the optimum

conditions for your grow room to get the best growth and maximum yield so plants

of course need adequate water and nutrients to grow healthily but

photosynthesis which is the driver of the plant growth it would be largely

determined by the amount of light the plant receives the amount of co2 the

plant receives and also the temperature of the environment which will determine

the rate that the photosynthesis occurs the data and the references that we're

using in this guide are taken from a University study published in 2008 by

scientist Suman Chandra which are laboratory studies carried out on a high

potency strain of cannabis sativa where they looked at the influence of

different temperatures light intensity levels in par and co2 levels and the

effect on plant growth so let's look at each of these in turn so first we look

at the level of light intensity that the plant is receiving and we're talking

about photosynthesis of course we're going to be talking about light in terms

of the horticultural reference which is par photosynthetically active radiation

and at par levels up to 1500 micro moles per meter square per second you can

increase growth rates however it's also shown that once you get past around

seven or eight hundred micro moles per meter square per second the rate of

growth that you get is not really worth the amount of extra light energy that

you're having to input into the plant so it's generally accepted that around

seven or eight hundred micro moles per meter square per second is the best

trade-off between getting maximum growth and not having to use too much energy to

get that growth and all the heat and everything else that comes with it of

course in this is for the flowering stage in the vegging stage you would aim

to get about 50 to those levels so somewhere in the

region of about 300 350 micromoles per meter square per second you can achieve

this by getting your light fixture reducing the output from your light

fixture using a dimmer if you're using a number of fixtures by having the number

of fixtures you are using or by just raising it about one and a half to two

times higher than its optimal hanging height and this will reduce the

intensity directly underneath the light and reduce the light intensity for the

vegging stage the optimum temperature for plant growth was tested at two

different light levels and sort of a medium of medium and power intensity

level of 500 micro moles per second and then a very high level of attires and

micro moles per second in both instances the maximum plant growth rate occurred

at 30 degrees Celsius and fall off falls off quite significantly where five

degrees above or below this temperature of course all different strains are

going to have have different requirements and needs in terms of

temperature our suggestion would be that a safe band of temperature to operate in

would be between 25 and 30 degrees Celsius and you should get optimum

growth and minimize the risk of stressing your plants through to higher

temperature finally we look at the impact of different levels of co2 on

Plank Road you can see the normal atmospheric level of co2 is about 370

parts for a million this would be air that you'd be taking into your grow room

from the external environment ie fresh air if you are replacing that fresh air

regularly the general guidance for circulating air range of grow room would

be about 60 changes per error and if you're achieving this it's highly likely

that you're maintaining that atmospheric level of co2 in your grow room

difficulty with using this system so drawing fresh air in and expelling it

out into the atmosphere is it's very hard to

increase the co2 level because if you if you input more co2 into the grow area

it's only gonna get drawn out just as quickly and so it's almost impossible to

artificially raise co2 levels there are a couple of ways of doing it you can

enclose the environment so that the air recirculates back into the grow room or

is recirculated around the grow room and you use a co2 sensor and some form of

adding co2 some technologies such as co2 bags or burners or co2 tanks and you can

use this to artificially elevate the co2 level in your grow room another method

you could use is to use effectively natural and free sources so we all expel

out co2 when we're breathing and therefore in occupied buildings the co2

level is often raised as much as twice the level of from the external

atmosphere that this would be normal and so if you can take air into your grow

room from an occupied building so a house or workplace you will most likely

be bringing in elevated levels of co2 into your grow room which will increase

the growth rate so I hope you have got some useful information out of this

guide if you have any questions or queries please leave them in the

comments below please subscribe and take care