[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [APD] artificial lightning indoors
I can't fix your problem but I want to work where you work.
Cari Bray wrote:
>> I'm sure this is a question that has been answered repeatedly, but I
>> thought I'd ask anyway. I have a custom-built growth chamber in my office
>> which is currently playing host to ferns. I have a second growth chamber
>> with a different setup (standard 95W fluorescent bulbs supplemented by 75W
>> incandescent bulbs, very low PAR of 30 umoles/m2/s at plant level), but it's
>> the first one that is giving me trouble.
> GC1 is a 10' x 12' room lit by twelve metal halide lamps at 400W apiece.
> The PAR in the room at the level of the plants is about 200 umol/m2/s, which
> is in the correct range to keep the plants happy (according to the
> literature). Unfortunately, many of the ferns are developing red fronds,
> which outdoors is a sign of too much light. I've put the ferns under 60%
> shade cloth to see if they will improve, but I would like to explore other
> factors that could be causing the problem.
>> Both growth chambers are watered and fertilized on the same schedule. GC2
>> ferns are green and healthy, leading me to believe that water and nutrients
>> are not the problem. Is it possible that GC1 is:
>> a) just plain providing too much light
>> b) providing light in the wrong spectrum
>> c) not providing enough light at one end of the spectrum or the other? (If
>> so, how do I fix it without having to replace too many bulbs?)
>> If anyone could "shed some light" on this problem I would greatly
>> appreciate it! I'm starting to run out of ideas.
Aquatic-Plants mailing list
Aquatic-Plants at actwin_com