Grow light heat with low ceilings can be a major grow room design issue. This is especially true for a small grow tent or for the basement grow room setup. But, it can also be the case for a container grow environment, like a shipping container grow, or even grow racks. Even using grow tables or trays can create a low ceiling in that you are losing some vertical space to start. All grow lights and even the best grow lights will damage the plant canopy as the plants vertically outgrow their grow room. So, what is the answer to get the grow room heat off the top of the canopy?
All grow lights
There is one brilliant solution that works every single time. This grow light system tweak works with intensely powerful LED grow lights and with double ended grow lights. This grow room equipment modification is also effective with plasma grow lights, high-pressure sodium and metal halide grow lights. In other words, it doesn’t matter which grow light system is in use because they all have similar proximity issues. And, to that point, we have this. The issue of heat damage to the canopy is solved when we make this one simple change. We simply put our grow lights on grow light movers.
No hot spots
LightRail light movers eliminate the hot spot that stationary grow lights create. They absolutely solve the problem of grow light heat with low ceilings. So, to understand this grow equipment variable, here are the ppfd numbers for a stationary 1000 watt DE grow light. And, that’s at 25 inches distance to the canopy in a five-foot-long coverage area. The middle has a ppfd reading of 942 and the ends have a ppfd reading of 148. Then, shortening the distance to the canopy with that same grow light to 20 inches to simulate plant growth, we have these numbers. The middle ppfd reading is now 1472 and the ends are now 122.
Grow light heat with low ceilings – Not a good match with stationary grow lights
Now imagine our plants growing to get even closer to the indoor plant light. When the distance is reduced to 15 inches, we see this. The middle ppfd reading is now 2915 and the perimeter is now 90. That is intensely horrible for the unlucky plant that is positioned under a stationary grow light. It’s a never changing hot spot except that it only gets worse as the plant grows and gets larger. Also, notice the plants that are positioned just off-side will get very little indoor plant light. So, we can see that grow light heat with low ceilings is not a good match with stationary grow lights.
A different grow room setup scenario
Now let’s take this same 1,000 watt DE grow light and let’s move it along a light mover rail. At 25 inches from the canopy, our grow light ppfd reading on the canopy and in the middle is 484. The reading at the 5-foot perimeter is 338 ppfd. Then, when we have the plants grow to within 20 inches, the LightRail light mover gives us a ppfd reading on the canopy of 614 ppfd in the middle. And, we get 460 ppfd at the 5-foot perimeter. Then, as the plants grow larger and get within 15 inches of the grow light, we see this. The ppfd reading in the middle is 858 and the perimeter ppfd readings are 720. So, it’s a totally different scenario when we move our grow lights on LightRail light movers.
122; 602; 1472; 610; 122 or would you rather have 460; 616; 614; 616; 460?
So, as a reminder and also to include the numbers at the three-foot closer in the perimeter, we have this. At 20 inches from the canopy, a stationary grow light gives us these ppfd readings along a five-foot length: 122; 602; 1472; 602; 122. LightRail, in contrast: 460; 616; 614; 616; 460. Then, as plants grow and at 15 inches, a stationary grow light ppfd: 90; 590; 2915; 590; 90. For LightRail, it is 720; 878; 858; 878; 720. For grow light heat with low ceilings, the numbers are clear. And, this can all be easily duplicated by any of us with ppfd meters.
This heat damage to the plant canopy is really more than grow light heat with low ceilings. In other words, it’s more than the grow light temperature heat. That’s because it is just as powerful with low heat grow lights. Again, LED grow lights can do just as much damage when they are too close to the plant canopy. So, it’s a matter of grow light intensity. And, that grow light intensity is forced to be positioned closer with vertically challenged spaces.
That’s in setting like a small grow tent, although all grow tents have some vertical height limitations. Basement grow rooms are also limiting and many only have a seven-foot ceiling or less. Yet, it’s prime real estate and absolutely can and should be used for our grow room design. Container grows like shipping container grow rooms can also have height limitations. And, grow racks are naturally vertically limited, by definition.
A better quality of indoor plant light to more plant surfaces, including below the canopy
No matter what our grow room setup space is, we can benefit by moving our grow lights with grow light movers. By doing this, we get the grow light intensity evenly dispersed along the plant canopy. And, we get a better quality of indoor plant light to more plant surfaces, including below the canopy. The results are a much more even outcome, along with faster growth and better yields. Those benefits are just as important as reducing the grow light heat with low ceilings setups. But, when we have the extreme hot spot that stationary grow lights can give us, simply reducing that effect can seem like reason alone to move our grow lights.