Salutations VoidTraveler,
VoidTraveler wrote:...a professional grow light consumes too much energy... I'm aware I'd probably get much better results with a professional grow light but my budget doesn't allow for that at the moment.
It's not clear to me how tall those 5 types of plant previously mentioned will get, nor what temperature and humidity levels would be suitable for that matter. Yet i can show you what i've tried in terms of CFL lightning so far:
Since you've decided to go the DIY route my advice to you would be to take a modular approach under the present circumstances. In the begining your seedlings will have very modest needs so it won't be necessary to buy the whole setup all at once... After a few weeks more modules can be added when light "penetration" issues arise. In my exemple an horizontal bar mounted on telescopic tripods serves as support for such modules which slide horizontally on it, in addition to having their vertical position set about 10 cm (4 in.) above the canopy, typically.
I could have suspended chains to my ceiling but just prefered something less invasive which 1 person can dismantle in fairly little time without leaving any trace. At 1st i tried a lamp holder equipped with a reflector and a claw but the cost rapidly became prohibitive so i experimented with more affordable hardware (1 piece of wood, 2 ceramic lamp receptacles, a power cord and screws). The (split-sockets) dual-lamp adapter is an option meant to add CFL bulbs above the center area.
That's still going to cost though, so perhaps a ready-made commercial product wouldn't be such a bad idea: the expense of making successive mistakes does accumulate after all!
In any case, it sure helps a great deal to have some convenient system allowing easy
2-axis relocation of CFL light bulbs!!
And by the way, safer bulbs with a plastic confinement coating will inflate the bill but should an accident occur you might find yourself lucky to avoid spilling toxic substances on those vulnerable yummy plants under! Additionally, multiple bulbs mean that heat gets distributed more evenly but the consequence for this is that the number of ballast assemblies producing such heat is also raised in the process. It seems there's some trade-off to make by finding the right balance between overall heat and global cost, past some limit you'll probably need to look closer at more popular technologies.
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VoidTraveler wrote:...growing without the use of a light isn't really an option.
Wouldn't it be possible at all to consider an hybrid concept where sunlight is put to contribution if available while CFL lightning would complement as needed?
Last summer i adopted the habit of moving my plants from one window to the next, this allowed me to provide a maximum of about 10 hours of sunlight on a cloudless day - which i optimized a bit further by installing a light reflective panel behind, in order to flood my girls with light from both sides...
Most unfortunately, cultivation behind a window doesn't seem to be such a great idea in the Northern hemisphere. After a while i came to believe that a "Docking Station" for plants would be essential for better results (weak plants are vulnerable to desease), etc. Now i think that my next major gardening project should assume the form of a large piece of furniture for my kitchen, with no bottom panel but a mobile accessory on wheels to carry the plants around instead... Its back-side would supply proper ventilation through natural convection, etc.
Anyway, i wanted to illustrate the fact that seedlings don't stay small forever. What worked initially is bound to fail once a culture has grown many times in size... It's quite important that our plants remain healthy during their early days, consequently i no longer plan to start anything behind a window again. I also decided to put a stop to stretching a while ago (rapid gain of height will translate as bad news under CFLs!), so i restrain them to promote low-profile shapes.
Beware, a minimalistic approach may lead to difficult problems as illustrated below:
This particular plant went through all sorts of punishment and hence eventually became an easy pray for the parasites that caused its loss in the end...