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#216 - Sunday, June 12, 2016 Dear Fellow Grower,
In today's issue... - Learn about different types of reflectors for indoor grow lights so you can get the best one for your grow space!
- If your plant is stressed out, try our 4-step plant health "tonic" for a faster recovery!
- This week's trophy pic features a mystery kush grown under a Kind LED!
Nebula Haze & Sirius Fourside (founders of GrowWeedEasy.com) "Act as if what you do makes a difference. It does."
~William James
What's the Best Reflector for HIDs? by Nebula Haze |
When growing cannabis under HID grow lights like MH or HPS, you want to take as much light from the bulb as possible and deliver it directly to your
plants. This is important because maintaining strong light levels in the flowering stage is the only way to grow dense buds and get brag-worthy yields. Higher light levels (up to a point) are also associated with increased potency. By using a reflector (especially when combined with reflective walls), you can get a significant amount of extra light to your plants without using any more electricity, resulting in faster growth and bigger harvests.
The hood / reflector focuses light down, increasing light levels experienced by the plants
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But which reflector is best for your grow light and space? Is it worth it for you to get a better or more expensive reflector
than what you have now, or will your results end up being about the same?
Let's break it down!
Always Get an Air-Cooled Hood
There are three main types of hoods/reflectors: wing reflectors, cooltubes, and air-cooled hoods. Each of these types will reflect light down onto your plants, but they differ in how well they reflect the light, and how well they contain the heat of the
bulb.
In order to get the highest levels of light to your plants you need to be able to keep your grow lights close, but that can be impossible when the heat from a naked bulb is beaming directly down onto your grow space like with a wing reflector.
Wing
Reflector (sometimes called a "bat wing") - Cheapest type of reflector, be careful of sharp edges! Wing reflectors are usually pretty good at reflecting light, but they can make it difficult to prevent heat from beaming down on your plants. Even if you have a fan blowing directly over the bulb you may not be able to keep bulb close enough for maximum light efficiency. Not recommended.
An air-cooled hood is a must to contain the heat from your MH/HPS bulb so you can safely bring your light close to your plants. The heat gets contained behind glass, and the hood itself can be easily
hooked up to a fan to vent extra hot air outside the grow space.
If you take a bulb from a wing reflector and put that same bulb in an enclosed air-cooled hood, the overall temperature in the grow space will likely stay about the same (since the bulb is still giving off about the same amount of heat), but the temperature felt by your plants in the top canopy will be dramatically less since the heat is
being enclosed near the bulb instead of beaming down. That means you often will be able to keep a bulb much closer if it's in an air-cooled hood compared to a wing reflector, increasing light levels without causing extra heat stress to your plants.
Additionally, if you want to make a closed system (like if you wanted to supplement with CO2) you have to use an air-cooled hood in order to vent out
heat.
Air-Cooled Hood - considered the "golden standard" of reflectors, they contain heat away from your plants by trapping it behind a piece of glass located at the bottom of the hood. They have holes in the side so they can easily be hooked up to an exhaust fan via ducting. Air-cooled hoods are the most effective type of reflector when it comes to
reflecting light downwards while also keeping plants cool. They are even good at containing heat when not hooked up to an exhaust (though venting out the extra heat will certainly give you the best results). Highly recommended!
Cool Tube - A Cooltube is a variation of an air-cooled reflector that takes up less room so it can still contain heat but will fit in smaller spaces. Although
these are great for cooling, they usually have a smaller (less effective) reflector than either a batwing or a full-sized hood. Only recommended if you can't fit a full sized air-cooled hood in your grow space! Summary: Why get an air-cooled hood?
- Most effective type of hood for reflecting light down to your plants
- Prevent heat stress by containing heat near the bulb (also giving you overall greater environmental control)
- You are able to keep lights closer to plants for increased light levels using the same bulb/electricity
- Can be easily hooked up to an exhaust system or a carbon filter via ducting
- Ideal for grow tents as they have been specifically designed to work together to help growers create the perfect indoor growing environment
- Essential for a closed system (ie if you
wanted to supplement with CO2)
Get the Most Effective Hood for Your Light & Space - Narrow vs Wide Dispersion of Light
When growing cannabis in a tent or other restricted space, you want to get a hood that's been specifically designed to get the most amount of light to your plants in a space like yours with the bulb you have.
Hoods either reflect light straight down or they disperse light in a wider area, and
each type of hood can be a good option depending on your goals.
Hoods and reflectors that are more narrow/tall with straight edges tend to beam light down more directly, which means plants will experience a higher intensity of light (and increased penetration below the canopy), but in a smaller area. This can be helpful if you're growing with big grow lights that must be kept further away from your
plants, or if you're growing in a tall space and want deep penetration.
Tall, narrow hoods with straight edges tend to beam light directly down, providing deeper penetration but also reducing the light footprint
On the flip side, hoods that are wide and short with angled sides tend to disperse light over a wider area. It's helpful to get a hood that disperses light if you want to maximize the area that receives
light (create a bigger light footprint, though light is less focused). A hood that disperses light over a bigger area can also be kept closer to your plants as long as heat is under control, thus increasing light levels without reducing the light footprint up to a point. This can help create strong, even light levels over your entire grow space even with a smaller sized light like a 250W or 400W HPS.
Hoods that are relatively short and wide with angled sides disperse light over a wide area
Get a tall, narrow hood with straight edges if...
- You want to get deeper penetration below the canopy
- You want a high level of light in a focused area
- You plan on keeping lights relatively high above the plants
Get a short, wide hood with angled edges if...
- You want more even spread of light coverage
- You want to cover a larger area with your grow light
- You want to be able to bring your light closer without sacrificing footprint (great for increasing light levels with some of the smaller HPS sizes without increasing electricity usage)
- Although there are specific cases where a more narrow hood might be more effective, I personally believe most hobbyist growers would be better off with a wider hood, as it lets you give plants higher light levels by moving lights closer, without reducing the amount of space you can use to grow plants. However, wider hoods often cost more than narrow hoods so if price is an issue, that may be a consideration.
A few last tips...
Get Most Reflective Hood as Possible (95% Reflectivity)
Hoods commonly come labeled as having 85% or 95% reflectivity (though some may not say anything about reflectivity, which usually means it's 85%). Although it's often more expensive to purchase a hood with higher reflectivity, it's not a bad idea if you can afford it! Although there's not a huge difference in performance between the two types, the 95% reflective hoods definitely do reflect more light. Every bit of extra light received
by your plants can make a difference!
A Good Hood Can Be Opened Up
This may be something you don't think about
the first time you're getting a hood/reflector, but they each have different ways to get inside so you can screw in your bulb.
If possible, get a hood that's been labeled as having either "hinges" or "sliding glass" (preferably hinged) in order to get to the light socket. Otherwise you might be sticking your hands in from the side air hole whenever you want to change the bulb. Not being able to get
past the glass can also make it difficult to clean the inside of your hood if it gets dirty (and the glass should be as clean as possible to make sure it's not blocking any light from getting through). However, although this is a matter of convenience for you, it doesn't really have much effect on your plants. Do I want a 6-inch or 8-inch opening on the sides?
Every air-cooled hood has an opening that can be used to
connect the hood to a fan or ducting. These openings come in different sizes, so which do you choose? 6-inch is the most common size, and has the most options, but you may have reasons to want a bigger size.
6-inch - Effective for cooling up to three lights that are hooked together <--- Most common sieze, if you're not sure, get this!
8-inch - Necessary to get enough airflow when more than three lights are being hooked together, though you have fewer options
Make sure your hood has the right sized openings for the ducting you plan to use (if in doubt, get one with 6-inch openings) Now that you know a little bit more about different types of hoods and reflectors, are you ready to set up your light and start growing? Learn how
easy it is to set up your MH or HPS grow light!
Plant Health Recovery "Tonic" |
When your cannabis plant gets sick, the natural reaction is to diagnose the sickness and fix the root of the
problem.
But is there anything you can do in the meantime to help your plant while it recovers?
The following tips are easy-to-do treatments your can perform to provide relief to your plant for almost any kind of stress. The following steps are sort of like a general health "tonic." Although these things might not fix a problem on their own, they will help your plant recover more
quickly!
Some symptoms are common when the plant is stressed, regardless of what is causing the stress. As long as you fix the root of the problem, the tips on this page will help plants recover more quickly from problems like...
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I am on probably my 20th grow now and I still do not know it all. This site has been amazing in it's advice and a great resource. Started reading at grow 1 and continue to as needed.
Last grow, I got hit with spider mites during flowering. UGH. Wife brought home store bought flowers and within 3 days, BUGS! But I digress. With the help of this site, I still managed to have a good grow and decent yield.
Thanks! Rickster
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"Kind 1000 LED grow light. Plant is a mystery kush at 6 weeks."
~medicalman
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Just in case you were interested... ~Nebula We encourage you to forward this email to a friend in need!
Who Runs This
Newsletter? |
Nebula Haze:
Medical cannabis is important to me personally, and I'm dedicated to showing others how easy it is to grow their own supply of
cannabis at home.
It is my mission to educate and build growing resources to help both new and advanced growers get bigger, better yields with less time and money. We update GrowWeedEasy.com at least weekly (often even more often!) to make sure that our website provides you with all the information you need to succeed at growing! |
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Learn which seed sources are personally recommended by Nebula Haze |
Sirius Fourside:
Sirius Fourside is a hobbyist grower who has gained the bulk of his experience growing in water as a medium (deep water culture,
bubbleponics).
"Growing cannabis is a relaxing hobby in and of itself, but it also saves you money and keeps you from having to deal with shady characters. Cannabis is much
easier to grow than people give it credit for, and growing in water doesn't increase the difficulty much, if any. But whether you want to grow in water, coco, or a different medium, we'll show you how easy it can be!"
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View list of trusted seed sources:
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