Re: [AGA Member] Re: help about fluorescent bulb

["S. Hieber" <shieber@yahoo.com>]

I have bought bulbs from a few places, including ebay. The
best bulbs I've gotten are from AHSupply. I started out on
the 5 K bulbs but I pretty much use 6500 or 10000 K bulbs
now. Simply a preference for my eyes.

The plants seem to care more about the intensity than the
color temp. Even for redness, the overall intensity seems
to matter more than the rated color temp.

Scott H.
--- Max Chang <cpc1007@yahoo.com> wrote:
> Scott,
>   so how do you choose bulbs usually?
> will you prefer 'Full spectrum' or 'Trichromatic'
> bulbs? Thanks for all the knowledge. 
> 
>   I picked some high color temperature bulbs because I
> didn't find spectrum information provided, so I
> thought higher color temperature would give more the
> light that red plants want. But guess the spectrum
> doesn't really depend on the color temperature, but
> might depend on what they put in the tube?
> 
>   
>   And about the nutrient issue, I use RO water mixed
> with little bit tap water and add iron twice a week.
> Also have 'fertilizer ball' inserted around plants
> root. I guess I should add liquid fertilizer instead
> of only adding iron, maybe the little bit tap water I
> mixed in doesn't provide enough necessary elements. 
> 
> 
>   Again, thanks a lot for the information and
> knowledge you provide. 
> 
> Max
> 
> 
>   
> 
> --- "S. Hieber" <shieber@yahoo.com> wrote:
> > CRI is a subjective index that represents the degree
> > to
> > which the color of objects illuminated with the
> > device will
> > appear as they they due under "normal" light. A
> > standard
> > incandescent bulb will have a CRI of 100. A good PC
> > bulb
> > might be in the 80s -- and that's fine.
> > 
> > Color temp is rating that indicates the overall
> > color ofhte
> > light. A bulb with a high narrow blue peak and a
> > broad
> > lower red peak will have the same color temp as a
> > bulb with
> > a broad lower blue peak and a hig narrow red peak.
> > Two diff
> > bulbs withthe same color temp rating can appear very
> > diff.
> > The only good assessment of the spectral output of a
> > bulb
> > is a graph that correlates the amount of output with
> > frequency.
> > 
> > As a rule of thumb, the higher color temps appear
> > more
> > bluish. The lower color temps can appear more
> > reddish,
> > yellowish, greenish. . . .  You need to compare
> > actual
> > bulbs or buy from a supplier that chooses good bulbs
> > -- if
> > yoy do that, your plants won't much care which bulbs
> > you
> > buy -- I beg off, however, on the issue of redness,
> > which
> > seems to be very much in need of sorting out.
> > 
> > What plants prefer re bulb color temp ratings is a
> > bit more
> > vague except that in general, plants are more
> > senstive to
> > the color frequencies that Humans are less sensitive
> > too
> > and vice versa. A bulb that looks brighter than
> > another to
> > us might seem jsut the opposite to plants.
> > 
> > The output of a fluorescent bulb isn't jsut a matter
> > of
> > what phosphors are used but also the amount of
> > impurieties
> > in them.
> > 
> > Scott H.
> > --- Dennis Sheridan <dilvish@pacbell.net> wrote:
> > > ----- Original Message ----- 
> > > 
> > > I'm curious about CRI - color rendering index. I
> > can see
> > > the obvious
> > > difference in what my eyes appear to see at 10k as
> > > opposed to 6.7k.
> > > I understand, I think, that much of this is due to
> > the
> > > phospers that
> > > different bulbs use (in that some bulbs have a
> > lower cri
> > > rating than
> > > others). I assume it is important to select bulbs
> > with a
> > > high CRI.
> > > Does it necessarily follow that high CRI gives you
> > a
> > > closer
> > > approximation to "true color", whatever that may
> > mean?
> > > 
> > > If 6.xk approximates (to a plant) noon day sun,
> > and 5.xk
> > > mid-morning, that would mean that our plants are
> > always,
> > > when lights
> > > on, in either mid-morning or noon sun. Does this
> > need to
> > > be taken
> > > into account in terms of dosing, hours, algae
> > control,
> > > etc..  or am
> > > I overcomplicating?
> > > 
> > > -d
> > > 
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> > 
> > 
> > =====
> > S. Hieber
> > 
> > -  -   -   -   -   -   -   -
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> > to the AGA Annual Convention
> > Nov 2004 -- Baltimore
> > 
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=====
S. Hieber

-  -   -   -   -   -   -   -
Amano Returns
to the AGA Annual Convention
Nov 2004 -- Baltimore

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