Cannabis Grow Rooms

hi all i have a few questions regarding carbon filters i was hoping someone could clear up for me 1. i notice they come in different lengths. eg 250mm diameter is available in 500mm, 800mm, 1000mm length. what is the difference between a longer vs shorter filter? (besides price difference) . would a shorter filter be less efficient or be more restrictive on the air flow? should one always go for the longest filter they can afford/use? 2. what length filter would you recommend in (for example) a 4 x 1000 watts HPS g-room with a 250mm centrifugal fan (500watt fan - very powerful). 3. where should the filter be mounted? before or after the fan? (i have been …

hi all i have my 1000w hps lamps @ 50 cm from the plant tops (scrog method). the temperature at the plant tops is @ 30 degrees. there is no signs of light bleaching or leaf twisting from heat would i be better off lifting the lights to @ 60 cm from the plant tops and therefore reducing the temp at the plant canopy to @ 28 degrees? or is it better to have the lamps as close as possible for maximum light penetration - despite an increase in temps thanks

hey all.i went out and bought me self two 250mm lenco ceiling fans.i want to change one to a intake fan is there anyway it can be done i dont really want to mess around with wires untill i know what i'm doing.thanks for any info

Hi all Can I use an A/C with a digital thermostat setting (split system type) 1kw to cool a 3 x 3m grow shed running a 1000w MH? Can I use the A/C as the only source of air with NO intake or outtake fans? treestump

hi ive got the luxury of dedicated HPS 1000 watt globes/ballasts and also MH 1000 watt globes ballasts. traditionally, ive used the MH in veg then as soon as they go 12/12 i switch the globes and ballasts to HPS. ive been told the following: 1. use Metal Halide lights until the start of your 3rd week of flowering to control your node lengths (hieght) 2. finishing with halides for the last week or so >icreases the density 3. HPS lighting is more absorbed by plants and gives a quicker growth rate but at the expense of internodal stretching. If using HPS right through i would advise to clip out your centre lead stem to encourage lateral growth and a shorter str…

I was just reading a post by "Weedman" in grow room design and set up. Instead of hijacking his, I've decided to start my own here. This topic would relate to everyone here this time of year "How do I deal with the colder temperatures?" as we are heading towards winter here in Oz :scratchin . One advantage that we have going for us HID users is that our lights create allot of heat already which is a problem in summer; which, in turn is handled buy adding more fans and more air circulation. We could use this in winter, but in reverse. Too a certain extent. The plants need a minimum amount of Co2 to survive. So we have to at least draw in some air. But what if that a…

last crop i accidently left the pump off!!! didnt feed for 3 days. grodan tried up and plants wilted. stressed but they yielded more than ever! could it be that stressing your plants at the end by not watering leads to increased resin production or something??? any thoughts?

well ive read and googled and called my auntie and well im looking at a 400W hps for my first project involving indoors and pot. i have only ever grown hydroponically outside with decent yeilds on my fruits and vegtables. so i am now going to try dope indoors. i was just gunna go outdoors but housemates tend to be out in the pool alot so its not really a goot idea. my room /a converted shed. is insulated and such but it still gets rather warm. my grow space is 800*800*1800 1850 is the roof height (my room was made for hobits!!) i can pick up from some place down on beach rd in malaga a 400W hps kit for $210 ballast shade and lamp. is this a good price and should …

its a sylvania 1000w MH lamp that has been floating around my house for the past few years it has finally come to some use as i just picked up a deal on ebay and all i need is the lamp how old do u think this one is by the pictures? im thinking not very old but could be wrong

Hi can any-one tell me where I can get envirolights in Australia or any kida grow lights which do not kill my power bill? Thanks