14 Nov
2005
14 Nov
'05
8:37 p.m.
From: "John Allain" <allain at panix.com>
For many requirements like this (aquariums, hydroponics, etc), the lighting of choice is
high-Kelvin Metal-Halide lighting. With bulbs over 150W, you can get 10,000 K bulbs, and
at 175W and above, you can get 14,000 K. Bulbs go to 1000W and more. All of these are
very bright & very, very blue-white.
If you are more interested in "natural Sun-like" spectrum, there are numerous
choices in VHO florescent bulbs, again in the aquarium & hydroponics world. These are
*totally* different than the florescent bulbs you get at the local hardware store.
Pretty much anything you get at, say, Home Depot, even the "aquarium bulbs" or
"grow bulbs", will be noticeably inferior from a spectrum perspective. Stick to
the hydroponic or aquarium stores.
Ken
>>>>>>>So given the choice, what lighting *is* good?
>>
>>
Natural white seems to be worse in traditional fluorescents, but newer
corrected bulbs are available.
Expensive stores and some art galleries like to use high temperature point
sources, like 12V50w reflector lamps. They may be among the whitest, and
can be used either in quantity for an almost daylight look, or sparingly, to
allow the blinkenlights to be prominent.
14 Nov
14 Nov
8:55 p.m.
New subject: Lights
Ken Seefried wrote:
From: "John Allain" <allain at
panix.com>
For many requirements like this (aquariums, hydroponics, etc), the
lighting of choice is high-Kelvin Metal-Halide lighting. With bulbs
over 150W, you can get 10,000 K bulbs, and at 175W and above, you can
get 14,000 K. Bulbs go to 1000W and more. All of these are very
bright & very, very blue-white.
Green Green . I want green! . The sun is green ... ears are pointed ...
>>>>>>> So given the choice, what lighting *is* good?
>>>>>>
>>
>
Natural white seems to be worse in traditional fluorescents, but newer
corrected bulbs are available.
Expensive stores and some art galleries like to use high temperature
point
sources, like 12V50w reflector lamps. They may be among the whitest,
and
can be used either in quantity for an almost daylight look, or
sparingly, to
allow the blinkenlights to be prominent.
If you are more interested in "natural
Sun-like" spectrum, there are
numerous choices in VHO florescent bulbs, again in the aquarium &
hydroponics world. These are *totally* different than the florescent
bulbs you get at the local hardware store.
Pretty much anything you get at, say, Home Depot, even the "aquarium
bulbs" or "grow bulbs", will be noticeably inferior from a spectrum
perspective. Stick to the hydroponic or aquarium stores.
Well all I got in Canada is the standard bulb fixtures. I got the screw
in florescent bulbs to save on power
but I don't like the color spectrum. I want daylight everywhere but I
can't change the fixures. Any Ideas?
Ken
15 Nov
15 Nov
7:26 a.m.
New subject: Lights
On Tue, 15 Nov 2005 02:55:58 +0100, woodelf <bfranchuk at jetnet.ab.ca> wrote:
Green
Green . I want green! . The sun is green ... ears are pointed ...
Cheap, low-grade fluorescent tubes are green. They are quite unnatural,
but give the highest light output for a given electrical input.
I can see it every morning from the windows of the main post office in
Oslo. The room where mail is sorted by robots and humans rarely go is lit
by that kind of tubes. It is very different from the other floors in the
same building, and does not look too nice to me.
People who need to evaluate colours often use neodym/praseodym (a.k.a.
didymium) lightbulbs. They have pinkish bulbs, and give a light which is
very daylight-like even at modest power. I got some which were made in
Finland (by Airam if I recall right). They seem to be rare and hard to get.
As for screw-in fluorecents, they come in at least three different colour
grades. The most natural-looking are of course also the most expensive.
--
Using M2, Opera's revolutionary e-mail client: http://www.opera.com/m2/
Ken Seefried wrote:
...
If you are
more interested in "natural Sun-like" spectrum, there are
numerous choices in VHO florescent bulbs, again in the aquarium &
hydroponics world. These are *totally* different than the florescent
bulbs you get at the local hardware store.
Pretty much anything you get at, say, Home Depot, even the "aquarium
bulbs" or "grow bulbs", will be noticeably inferior from a spectrum
perspective. Stick to the hydroponic or aquarium stores.
Well all I got in Canada is the standard bulb fixtures. I got the screw
in florescent bulbs to save on power
but I don't like the color spectrum. I want daylight everywhere but I
can't change the fixures. Any Ideas?
11:27 a.m.
New subject: Lights
On 11/15/2005 at 1:26 PM Bj??rn Vermo wrote:
> Green Green . I want green! . The sun is green
... ears are pointed ...
Well, there's always low-pressure sodium vapor (turns everything yellow).
:) Any fluorescent lamp is going to have a very jagged spectral output
and will photograph badly, which limits you to incandescent lighting. For
photography, you can't beat standard photoflood lamps.
People who need to evaluate colours often use
neodym/praseodym (a.k.a.
didymium) lightbulbs. They have pinkish bulbs, and give a light which is
very daylight-like even at modest power. I got some which were made in
Finland (by Airam if I recall right). They seem to be rare and hard to
get.
I've seen them on eBay, but they're usually pretty expensive. I've also
wondered about the useful lifetime of the bulb.
If you're looking for floodlamps, you can get standard edison-base floods
(e.g. R40 size) with a blue coating that will shift the spectrum a bit
toward the blue. These are marketed as "Grow Lights" and quite reasonably
priced.
I suspect that plain halogen flood lighting (available in edison base)
would be fine for most viewing applications. Search on eBay for "halogen
bulb" for some ideas.
Cheers,
Chuck
1:55 p.m.
New subject: Lights
Bj?rn Vermo wrote:
People who need to evaluate colours often use neodym/praseodym
(a.k.a. didymium) lightbulbs. They have pinkish bulbs, and give a
light which is very daylight-like even at modest power. I got some
which were made in Finland (by Airam if I recall right). They seem to
be rare and hard to get.
As for screw-in fluorecents, they come in at least three different
colour grades. The most natural-looking are of course also the most
expensive.
We got the " made in china " grade here. I never knew about the green
fluorensent bulbs before.
6825
days inactive
6825
days old
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bfranchuk＠jetnet.ab.ca -
bv＠norbionics.com -
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ken＠seefried.com