
I found this on line and thought I would share it.
http://vegvariety.cce.cornell.edu/
A descriptive journal of hydroponic gardening projects; this blog replaces a paper journal, and is intended for my record keeping purposes. It is not intended to teach hydroponic gardening, but is rather a record, including editorial comments, of what has worked for me. Copyright © 2019 Hydroponic Workshop Weblog - All Rights Reserved.
The UV LED project box is simply suspended by a clip from the reflector shield, as I just could not bring myself to build any sort of support for it.
Day and Night:
Day length or duration of light received by plants is also of some importance.Poinsettias, kalanchoes and Christmas cactus flower only when days are 11 hours or less (short-day plants). Some plants only flower when days are longer than 11 hours (long-day plants), while others are not sensitive to day length at all (day-neutral plants).
Day Length:
Increasing the time (duration) plants are exposed to light can be used to compensate for low light intensity, as long as the plant's flowering cycle is not sensitive to day length. Increased light duration allows the plant to make sufficient food to survive and grow. However, plants require some period of darkness to properly develop and should be exposed to light for no more than 16 hours per day. Excessive light is as harmful as too little.. When a plant gets too much direct light, the leaves become pale, sometimes burn, turn brown and die. Therefore, protect plants from too much direct sunlight during summer months.
Supplemental Light:
Additional lighting can be supplied with either incandescent or fluorescent lights. Incandescent lights produce a great deal of heat and do not use electricity very efficiently. If artificial light is the only source of light for growing plants, the quality of light or wavelength, must be considered. Plants require mostly blue and red light for photosynthesis, but for flowering, infrared light is also needed. Incandescent lights produce mostly red and some infrared light, but very little blue light. Fluorescent lights vary according to the amount of phosphorus used by the manufacturer. Cool-white lights produce mostly blue light and are low in red light; they are cool enough to position quite close to plants. Foliage plants grow well under cool-white fluorescent lights, while blooming plants require extra infrared light. This can be supplied by incandescent lights or special horticultural fluorescent lights.
This phrase in particular caught my attention: " Plants require mostly blue and red light for photosynthesis"The LED grow light I am planning will only produce red and blue light. The theory being; why waste energy producing green, orange, yellow and violet, when the plant does not use, or need it? Plants reflect green light, that is why they look green to us..
As an experiment I have added a small project box containing six UV LEDs to the lighting supplied to the dianthus and ornamental pepper. The spectrum is in the UV-A range of near visible light. I have read several studies regarding the effect of UV light in plant growth. Some studies have concluded UV is detrimental, and some conclude it is beneficial. The LEDs I added have a wavelength between 395 and 410 nm. This wavelength is not considered harmfull and is very near the wavelength of blue light where photosysthesis begins.
Again, time will tell....

As I am continually starting small batches of seeds to keep the ebb and flow systems populated, I find the small propagator above to be ideal. It is a discarded container used to package greens from the supermarket.
Although we enjoy fresh salads in the winter, warm tasty greens are a welcome addition to our table.
This week we received a very elaborate 124 page full color catalog, printed on coated stock, from Baker Creek Heirloom Seeds. As a retired purchasing manager, I am aware of the cost involved in producing a catalog like this. It appears that these folks are very serious about marketing their seeds.
Our area in upstate New York is in the process of recovering from a severe ice storm. Everything was coated with an inch of ice, and hundreds of thousands of homes were without power for several days. As of today, there are still tens of thousands without power. One night the temperature was at four degrees, and it was not fun at all. The hotels were filled, and there were no generators, batteries, propane, or kerosene heaters to be found for sale anywhere in the area. We were without power for four days, however, I am fortunate enough to own a generator. Well, we have been through this any number of times over the years, so be prepared is a good motto to keep in mind.
As we progress into winter the seed catalog folks begin filling my mailbox with gardener's porn. Not that I mind in the least, as it sure beats credit card offers. (remember them?)
The plant in the photo is a Black Cherry tomato started from seed on November 5, 2008.
After reading my post regarding the Florida Petite tomatoes someone asked if I was sure that it is the world's smallest tomato.
The lettuce in the photo above has been growing in our basement under full spectrum fluorescent lighting for a few weeks. While in the process of changing one of the ebb and flow systems, I placed some of the plants in the greenhouse to take advantage of the afternoon sun.
Each year since I have been into hydroponic gardening I have grown tomatoes under lights during the winter. This year, for the first time, I will be trying the water farm drip ring system.
Well it is not pretty, but it works. I should say it sprays the nutrients around within the reservoir, and it does not leak. As to living up to all the praise I have read over the years; that remains to be seen. In any event, investing fifteen dollars to build one beats the hundred and sixty dollars to buy one.
In his book, How To Hydroponics, Keith Roberto writes: "If you are looking for the best performance for the least investment, build an Aerospring." Additionally, he promises "Aeroponic basil, from seedling to skyscraper in 45 days."
The plants in the bus tub ebb and flow system are still in the root development stage but are doing well also. They are receiving about four hours of direct sunlight each day with indirect light for the remainder of the day.
This small system can be assembled in a few hours and would make a great school science project.
Swiss chard is one of my favorite greens and I hope these are a success. Again, I will try to remember to photograph and post a photo each week. 
When I first began hydroponic gardening my rationale was why bother to grow it if you can't eat it? Now I find myself spending more time in the flower section of the seed catalogs.
As this is my first year with the greenhouse I am learning a lot about greenhouse growing, and I still have a lot to learn. For instance; I really should have begun another crop of heat tolerant plants like tomatoes, cucumbers and eggplant a few weeks after the first crop to have a continuous supply.
The ugly ripe tomatoes are starting to ripen and in my opinion they are OK, but really nothing special. The fruit is large and mostly fluted, and the taste is comparable to pretty much any other homegrown tomato I have eaten.
I decided a few days ago to begin growing replacement plants for the tomatoes and cucumbers. My rationale is that if I continue into mid October the original plants might run out of steam.
In my post of April 26, 2008 I included a photo of the two plants above. They were both started from seed on March 24, 2008. The plant on the right was placed in the AutoPot and grown in the greenhouse, while the plant on the left was grown outdoors in the garden. In my post of April 17, 2008, I wrote that by using the AutoPot I hoped to have tomatoes by early July. Well, they arrived on time!!
This Sarian runner has only been in this container for one month. I have been using a general purpose nutrient mixture of 1 teaspoon each of growth, macro, and bloom, which yields a TDS of about 1000 for this container.
A neat Father's Day gift I received from my son will be a great addition to the greenhouse and for growing under lights during the winter.
When I was building the greenhouse I considered constructing benches to support the hydroponic tanks, however I decided to simply place the tanks directly on the floor. They are supported over the gravel by pressure treated planks, which are in turn supported by the frames for the walk and the walls. The cost of the lumber and the effort of constructing the benches did not seem worth the effort. Another consideration was: that any large tank would require a pretty sturdy bench, so the floor was a better option.
Well the cucumbers are flowering and it is back to the artist brush to pollinate them. The little bug that was pollinating strawberries only showed up one day and has not been seen since. It is beginning to look like I will be spending more time using an artist brush than Leonardo Di Vinci. That, I guess, is part of growing vegetables in a hobby greenhouse. Commercial growers with large installations probably bring in bees. I know they use bugs to control other bugs, but I am really not about to invite bugs into my hydro environment on purpose.
Sometime ago I read study, by I believe Cornell University, that tomatoes exposed to the color red during the fruit production and ripening stage produce more and larger fruit. Since reading the study I have interwoven red felt strips on the branches with developing fruit of all the plants I have grown. I am not sure whether it is effective or not, however, it can't hurt to try.
We have had an unusual period of really hot dry weather and it has played havoc with the temperature in the greenhouse. I knew I would eventually need shade cloth, but had no idea of where to get one, or the value I needed. I had been using the nylon shade cloth that came with the flower house, and it did cut down on the light, but the temperature hit 100 degrees on a few occasions. That motivated me to get looking for a commercial quality shade cloth.
Well, the king will live just a little longer, at least until it is slightly soft to the touch, and then it will be history. This first Seascape berry is by far the best looking berry I have grown to date.
Today I decided to give up on the Temptation strawberries, and Alpine strawberries altogether. So far I have tried two different varieties from seed, and neither one has been worth the effort. My wife said "they taste like un-sweetened Kool-Aid", and I agree. The Sarian, however, seems to be worth growing, but I will be more able to make that call when they begin producing berries. As the Sarian sends out lots and lots of runners, I doubt I will have to grow them from seed again. The pistils on the flowers are fairly large, and I am waiting to see how big the berries are when they form. If I get a good size berry I will grow a few next winter.
This photo is a plant called Ugly Ripe Heirloom tomato and I am sorry I did not plant this variety in the greenhouse instead of the garden. A quote I found online concerning the variety reads:
There is of all things an Irish Mexican restaurant in town, and one of my favorite dishes is called chilies rellenos. It is basically poblano peppers stuffed with mexican cheese, breaded, and deep fried. It most likely clogs the hell out of my arteries, but I don't have them very often, and you only come this way once.
Here is the description regarding the Quinault variety of strawberry:

