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How to Determine the correct HID size/wattage for your space.
Grow Guide: How to Determine the correct HID size/wattage for your space. Category: Basic Growing
Author: Mr.Wakenbake Post Date: 03-19-2007
Rating: 4.13/5 (8 votes) Views: 4252
Your grow area is the plants environment, and we all want the best for our plants. We all want those big, fat, nasty buds that we see online and drool over. When it comes to determining how much wattage your space can handle there are a couple things to consider.

How big your space is will have a direct effect on how much wattage you can run in there.With HID lights whether HPS or MH, it's important to note that the smaller the space, the more the heat build up. So the other factor would def be heat.

Ventilating your space properly is key to successfully maintaining temps when using an HID light to grow your own cannabis.As with anything, you get what you put into it. So be sure to properly ventilate your space.


The charts below should help with determing light size in proportion to room size.I believe they may be slightly different and that's good, as people have differing views on what wattage is best for what space. All charts should be looked at as another guide in your decision on what wattage will be best for you and your plants.


Thanks Scorpoin King for this one.


This chart is not the absolute say in what size can fit in where. With the use of cool tubes, or vented light hoods one can fit a higher wattage lamp into a smaller space. On the flip side also remember that a grow area that is not adequately vented couldn't possibly run the wattage reccomended in this chart.

This thread is based on the assumption that your room is properly ventilated.

Another thing to remember is that the distance of your light from light to plants will effect coverage area. It will also have an effect on how intense the light is that's reaching the plants. Just remember, keeping the lights as low as possible increases your light penetration and increases bud weight. Just be careful not to burn the plants.

This next chart will enlighten you on how light intensity is affected due to distance from plants.

Webby posted this chart on here originally i think.Thanks web420



Please remember that these charts are not the absolute word or Commandments so to say, but just a guide to help you choose wisely. Remember if you overshoot and can't vent the heat, then your plants will suffer, and if you undershoot your yeild could suffer. Having a properly ventilated space will help you achieve the best results with your HID light, so keep that in mind.


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