Grow Light Part 1 – Figure Out Your Light Footprint
The short answer is that for one grow light, you should plan on growing 1-8 plants. If you grow more than 8 plants under a single grow light, chances are you’re hurting your yields by not giving each plant enough space to thrive.
The Kind “K3 L600” LED grow light (like the one pictured below) has a light footprint of 3’x4′. That means any plants growing inside that area under the lamp will be fine, but plants outside that footprint won’t be getting enough light.
A 150W HPS grow light can cover up to a 2’x2′ area, so all the plants in this picture are getting good light levels. However, any plants outside that main area would be starved for light. You can actually see the corners of this tent are in shadow.
So in some ways when it comes to timelines/yields and number of plants, it’s a matter of deciding how much personal time you want to put in to your grow on a regular basis vs how much time you are willing to wait to get to harvest. If growing several strains and getting to harvest as quickly as possible is most important to you, opt for more plants (up to 8 under each individual grow light). If you want a grow that’s easier and less time-consuming, opt for fewer plants.
Also, how much light is required for this size grow space. I'm thinking of either 2 x 300 watt LED's or 1 600 watt. Will that be enough light?
I'm preparing to get setup for my very first grow. I already have a 2×4 grow tent. How many plants am I able to get comfortably in that space?
It can depend on how long you veg, how you train, etc.
As a reference, 4 photoperiod plants well trained in a 4×4 is tight with 7 gallon fabric bags. So 2 plants would fit snugly. You could probably cram 3 in my opinion.
It really depends how big you want t grow your plants. You CAN put a few more smaller plants ( you’d save time on veg since you won’t have to grow them big before flipping) or you can put just a couple and veg em a bit longer to fill in the space. In my experience I’d go with less , bigger plants. More root more fruit my friend. Good luck