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400w of good quality led is enough for autos in this space running them 20/4 for photoperiod plants you Will need 540w... But i dont think you have 400w of leds here. Its based upon the power its drawing.

Going from what shane at Migro was saying it depends upon what you are growing. If autos then you need less PAR because of extended grow time. The plants only need 25w/sqft as apposed to photos which will need more at 35w/sqft because they only have a 12 hour light cycle. Working it out at...

Thanks this will save me a lot of money on the light fittings.. Are you using a large fan to cool these bulbs?

So with this logic perhaps 400w in a 3x3 but i ran a 400w hps in this space so no more efficient than hps? :confused:

How mamy Watts of LED are you running in your Area?is 200w sufficient in a 3x3?

And just out of interest did you have those four girls in a 2 or 3 foot? Im trying to get a handle on how much space im going to need

I think its a matter of when rather than if Germany legislates.. It could be another year. If they do manage to get it then it could be a turning point for the whole of the EU and other countries will follow . Theres big business interests lining up for a piece of the pie already.

Give her time... Shes got a while left yet.. Looking at some of your lower leaves you May be looking at a deficiency they are discolored between veins.. Check this out

If you want a perfect decarb Just vape the weed first then use that. The extra benefit that you can Just use it as is

Im not sure of the accuracy of these Phone apps.. I Just downloaded one and tested it under a 10w led light bulb and it was showing me that it was putting out 700 a few cm from the light.. Not sure if thats possible

God damb Frank! What medium are you running those in? What lights you got on em? For autos thats impressive!

Thanks ive checked Out the migro clip its very informative. According to him with 12 of those 13w led bulbs he would be getting PAR of 800mmol m2 thats even more than a 400w hps at only 150w! Im guessing the difference is how close you can get these leds.

So based On your figure of 24w/ft2 for a 2x2 that would come out at 100w and for 3x3 at about 225w. Is this enough light? It seems quite a low amount?

Thanks and what distance do you keep your light at?

Im not sure if this is the same with weed but tomatoes are intentionally buried this Way because it gives them a bigger root system

So you think the 12x25w led bulbs is overkill in 2x2? . Im wondering if 2x2 is even big enough maybe better to scrog em in a 3x3 and get the buds all even

Great thread thanks.. Im working my Way through it now.

Im getting 270w of led 27500 lumens for around 30 bucks plus the pennies for bulb holders and a bit of wire.. Ive plenty of board for free so i cant see it costing more than 35.

Yeah bog standard screw in bulbs. I was going to make it So that they can be switched on and off on different circuits because i know its too much for seedlings and smaller plants

Hey all! Is anyone here growing under shop bought leds? I was thinking to make my own fixture which will be in a 2x2 Space 1 plant and 270w of warm white leds. It gives off 27k lumens which is the eqivalent of a 250 hps.. The main advantage is the cheap price of setup with the obvious advantage...