The topic of hydroponics can conjure up mixed reactions where conserving resources and living self-sufficiently is considered. After all, hydroponics is usually thought of as fairly energy intensive — growing indoors requires artificial lighting or at the least lighting to supplement the sun’s energy in a greenhouse hydroponic setup. Nutrients have to be mixed with your water supply and power to circulate the water is required. And further, aren’t the nutrient mixes and pH balancing chemicals basically chemical soup manufactured by industrial/corporate operations? Doesn’t sound very sustainable to me.
True, but let’s consider the side of the argument that says, hey, with hydroponics, we can grow organic, eliminate or nearly eliminate the chemicals and pesticides we put in the earth’s surface, and surely we can use hydroponics in a greenhouse situation, maximizing the use of the sun. With hydroponics we can also minimize water usage and arguably grow closer to our market (important for urban survivalists
). Furthermore, natural source nutrient mixes are available. A lot of information regarding environmentally friendly hydroponics can be found on Site 101, in ezine articles and many others.
I’m just trying to kick off some discussion here. I have very limited experience with hydroponics, but my message is that with some creative dedication, hydroponics can be a powerful part of pursuing a sustainable homestead. As for my experience, back in 2005, I decided to pursue some hydroponic gardening. Mainly to have some good tomatoes out of season here in the Ohio valley. And I mean good, using heritage variety seeds. Growing tough crunchy tomatoes that would travel without harm but land on the plate and palate with no flavor was not my aim.
I had room in my basement to devote about 4′ x 8′ to growing. I worked diligently to make a platform to support the system,to curtain if off and to heat it. I eventually adopted the dutch bucket recirculating system to plant about 13 plants. Discussion of the details of the planting is not included here; my main focus is to be the lighting system which I built from scratch and which is discussed here to promote some thought regarding what can be done.
For lighting, I was considering everything. High Intensity Discharge (HID) lamps were the surest way to make a very substantial indoor sun. These systems have lots of research dollars behind them and provide really amazing results. The downside, where I was concerned, was the high temperature of the fixtures and the high energy consumption. Our basement has a low ceiling and would require close proximity of the fixtures to the wood floor joists. Having had a major house fire in ’95, I am super careful where fire hazards are concerned. Understand, the proximity of the fixtures to combustibles was the problem, not the HID concept. So – I was drawn more toward fluorescent fixtures which operate at a lower temperature than the HIDs, although probably not more efficiently. Considered first the high output T5 (5/8” diameter) tubes which are popular in Europe and were catching on in the US. They looked good, but found that the standard T8 tubes (1” diameter) with electronic ballasts had better warranties for the most part (5 year vs. 2 year) were more efficient and ran cooler and had more tube and spectrum choices. I was leaning then toward the T8 lamp fixtures. I suspect T5′s have made grown in popularity since then and that there are many more T5 choices these days. I found that Plant Lighting had very competitive pricing on good fixtures (8×54 watt lamp fixture for $300). All of the observations I’m relating here are subject to argument; I’m just telling my story, which is how I arrived at my eventual setup.
Given the costs of owning and operating the lighting, I pushed on into the concept of using LEDs for indoor/hydroponic gardening. In 2005, LED systems were expensive, but they could pay for themselves in less than 2 years of daily operation due to their lower energy consumption. There were a handful of LED fixture folks back then. Two web sites that seemed realistic in their performance and efficiency comparisons and their designs were LEDgrowLights and GrowWithLEDs. They are still in business, and their web sites offer some education regarding LED grow lights. There were other good sites and also some other companies online that made ridiculous claims for dinky little LED clusters. Use discretion. There are lots of good sources out there these days.
One of the energy advantages gained by LEDs is derived through their ability to generate the light concentrated only in the wavelength/frequency/color of light that plants need. The main color is an orangey/red, generated in the neighborhood of 640-660nm (nanometers) wavelength. Secondarily, a lesser amount of blue light is required, this light being in the 450-475nm range. Also, since 2005, more has been written about the necessity for some inclusion of a small amount of full spectrum “white” light which makes sense.
At that time, I felt that the LED lighting lamp/fixtures on the market were pretty anemic, so I researched the LED components that were available to build my own. One component family really grabbed my attention and I proceeded to develop a simple fixture based upon it.
These LEDs were an amazing “LED Engine” that clustered 7 groups of 7 junctions in an area smaller than a dime. This device was the Lamina Ceramics BL-2000 series. The red LEDs produced light at 618nm and about 18 ¾ watts! (these devices were listed at 14 watts but could be pushed with heat sinks and cooling) The blue LEDs were good at 470nm and about 4.4 watts. These LED engines were priced temptingly at $20 for the red, quantity 1, and only $17 each for quantity 25. The blues were priced at $12 and $10 respectively.
I contacted Lamina Ceramics at the time to see if a little lower frequency LED engine was available, something in “ideal” 640 to 660nm wavelength. While they could do it, the small quantity manufacture of an LED engine cluster would have been cost prohibitive for me, particularly while developing a prototype.
Before I go further, I must warn you that these items don’t seem to be available now. The company that made them, Lamina Ceramics, still has similar items (see Mouse, Digi-Key, Newark Electronics and others). I believe they still make the BL-2000 series LED engines in RGB (red-green-blue) or nearly full spectrum devices. I cannot find the units I bought previously (from Mouser). Lamina Ceramics has morphed into the Lighting Science Group. The devices I bought still show up in a search engine, but as obsolete items. I should note also that Lamina Ceramics has also released much higher lumen devices than the BL-2000 series. These have lots of promise as well.
Note that Lamina Ceramics sells the (major) heat sinks required to keep these boys from self-destructing. My fixture was built into a new ($8) 4 foot fluorescent shop lite that I gutted. I mounted 4 red BL-2000s and 3 blue BL-2000s LED engines. My ratio of red to blue wattage was about 75 to 13, a little heavy on the blue, but not a problem. Rule of thumb says about 10:1. Each of the 7 LED engines was mounted on a heat sink and the fixture was fitted with a muffin fan to provide forced air cooling.
I used two nice lab grade power supplies. This is not a requirement, but current limiting is necessary.
Powering up this fixture was dramatic. We’re talking retina damage. Looking directly at the red LED engines for only a second produced persistent after images lasting 2 minutes or so. Don’t do that. I was very happy with the amazing flood of light produced by these clusters.
So I grew some tomato plants from seed under this fixture. They grew very well. Very healthy and tall, kept growing up into the fixture which I kept raising. The LEDs did an incredible job. Sorry, no photos of the plants. One thing that doesn’t add up for tomatoes with LED lamps is that tomato plants like it HOT ! In my case, that meant heating the small area I had curtained off with plastic sheeting in the winter or summer. In my case, it didn’t add up. Conclusion here is that LED fixtures would gain the most energy savings by using to grow lower temperature plants, like broccoli, peas, endive, spinach, etc. I had proven my LED lamp grow light concept but did not elect to heat the space and therefore my plants did not yield fruit. My original desire to have tomatoes was met by buying at a good market. My main prospect had become to develop a viable LED grow fixture.
Because my fixture required uncommon voltage levels and current control I moved on from this prototype I switched gears to a design resembling a canister, with 1 cluster only per fixture. I felt these could be built inexpensively and would be very versatile. They were designed to operate on 12 to 14 volt DC, so they could be operated on automotive, RV, solar system 12VDC, inexpensive auto battery chargers/replacers, etc. They were designed using the Anderson Power Product’s Powerpole connectors which are ingenious and should be considered by anyone developing a project requiring 12VDC. ( See APP ) I have no connection (sorry) with these folks, I’m just impressed by this versatile system. My canister system did not get beyond the design stage, because as mentioned before, the Lamina Ceramic components went away.
Revisiting the LED grow light market these days is quite heartening. A quick look on eBay these days pulls up LOTS of nicely priced LED lamps and fixtures. (just search LED grow or similar) I have no experience with them, but I would consider mainly those that include a few white LEDs so your plants get all the spectrum they need.
Obviously, borrowing ideas from both the new and the old, the conventional, the scientific, the spiritual and whatever – is required when walking the path of sustainability. Thinking your way through things is good and pleasurable in my view. Traditions can provide insight; just keep in mind where they came from and how they may be built upon. Our ancestors survived and thrived because they adapted to changing requirements and new abuses from the system. We can honor our ancestors not just by blindly following them, but by progressing from where they were, just like they did themselves.
Are there easy answers where growing your own food is required? Sure, a few; but you’ve got to move on from there. Right now is an exciting time where technology is concerned regarding lighting systems and enhanced awareness regarding sustainability, etc. — This has yielded new LED lamps, new natural source nutrients, efficiently produced equipment, more efficient equipment and so forth. AND pretty much all of my research was done on line when I was experimenting with LED grow lights. Lean on the internet, and keep on keepin’ on.