You might find this useful in calculating the area and lighting requirements of your growroom.

growroomtools

Nice one mickle

Great work Mickle

Still no 250 though

These are old figures but will not be far out.

250w MH = average 18000 lumens
250 son_t plus av 31500 lumens

thanks ot1

Cheers!

Let us know when it's been added. Thanks Mickle, I remember now, you had asked for the lumens before

Thanks mickle, was running out of space on the back of my fag packet.

Would there be any way, or would it be of any use, mentioning after the calculation if your figures come within recomended limits?

Also in the ventilation bit, manufacturers tend to advertise their fans as cubic metres/hour, is there any chance that the calculator could also do that as well as cfm?

I'm not dissing Mickle, just thought that it would benefit peeps is all

Cheers in advance

For those of us using compact fluro's could you please add the following values to the calculator.

20w CFL = 1200 lumens

Smoky Owl

ok smoky owl i'll add that.
G-whizz i'll give it a go

Cheers Mickle

I know, I know



*walks away, muttering to himself about the 250, hoping Mickle ain't forgot that too*

I have allready added the 250W G-whizz but someone else adds it to the page

I can't get the 250

Its been updated now with the new lights and corrected values for the enviros, thanks for the feedback.

growroomtools

Good job, mickle.

hi cant get it to work, cant click the calculate button

SM

I won't be able to help you, but could you tell us more info about your spec?

What browser are you using and operating system

When you click calculate look closley and you will see the figures are faint but they are their

Took me ages to suss it ..

I thought it was'nt working .....

RAZ

Aye me too

nice 1 m8...3rd time lucky as they say....thought it wasnt workin....

Hi All

a little tip when using the Growroom Tools,yes it is difficult to read the results, so use your mouse to highlight whats in the box's its a little fiddly but it works ;-)

Hope this helps

BF

What is sufficient light for a single plant? My next grow will hopefully be alot bigger(15 plants), so what would be the best light to use for this? And how much space is best for that many plants?

Thanks in advance, Nude.

If there is a better place where I can ask questions plese point me there

Mickle rules i have just typed loads ov long post about this very matter trying to find someguidance and then i find mickles holy grail ov lighting calculations nice 1 bud

how come i cant get the area calculator to work. the calculate button wont press it just turns in to a txt sign?????????????????????????????????????????

great tool mickle but any chance you could add the 200w enviro so i can make more accurate calculations

hi mickle mate,when i put my info in for a 4ft x 4ft x 7.9ft with 1 600hps it says i need 144m3/ph but when i add 1 ,2 or 3 more lights it give the same answer 144m3/ph is this all i would need in this space for 4 600's hps

no m8 my room is 6 ft wide 4 1/2 ft deep & 6ft high with one 600w and a 6" fan and i just manage to hold the temp right and that moves 420 m3/hour how many plants are you growing in your space ?

You wouldnt put 4x600's in that space anyway mate

Ideally you need to be exchanging air in the room at least 20 times a minute so the calc will tell you what fans you need to do that

So no matter how many lights you put in it will still say the same as its not telling you nothing about temps

You yourself have to choose what light you can successfully control the temps of, if you know what I mean

You have to bring cool air in or else you will struggle with temps and then regulate the fans speed to achieve the right temps.Sometimes a heater is needed and sometimes an air con unit is needed

Owd

hi 200w enviro emits 13,500 lumens could you add this to your tool
thanks mate

yeah ive a 200 watt blue enviro cud u add this pwease?

is that red or blue ? i have 200w reds , oh sorry hi enviro`s

I'm trying to use the 20Watt (100Watt) GE energy savers, you can get them for £1.37 from Tesco (with a buy 1 get 1 free deal) are these bulbs suitible for growing in terms of light output and wavelength?

Thanks.

They will get your seedlings and cuts on the go but for flowering plants I'd say no.... plants need the energy from light to grow and 20w lamps just don't do it IMHO when you want to build bud as they don't emit enough energy. Personally, I started my first grow with an 11w aquarium strip, moved up to 6 x 15w cfl's, then + 2 strips, then a 600w all in a few weeks as m8's put me straight (got 2 cooled 600's in the same space now)....

plants need light just look how much grows in the garden in the shaded bits, not big fat stinking cannabis plants thats for sure! Also if you are on your first grow and haven't read up much then read up on carbon filters before you flower!

Mickle youre a fricken genius... I love you! Ya just saved me so much stress!!!

a metric one would be cool seeing as most tents and such are advertised in metres.

Great tool!

It's not that hard to use a converter via google if you cant work it out to be fair.

30cm == 1 ft (Or close enough)

1m2 tent 3.3ftx3.3ft
1.2m2 tent 4ftx4ft
1.5m3 tent 5ftx5ft

It's not hard.