Re: [APD] artificial lightning indoors

[Dennis Dietz <dennisdietz at verizon_net>]

I can't fix your problem but I want to work where you work.

Dennis

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.
>>
>> Cari
>>
>>
>>     
>
>
>
>   

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