I was looking for a bulb that has a better CRI as I understand it (color
rendering Index?) There are lamps out there that have it but are much more
expensive. I thought if I used a bulb designed for a photo lamp I would
be closer to what I wanted. I am mostly interested in lighting the corner
of the room I am working in as the rest of the room has lighting good
enough for what I am doing there. I know that I don't want the light
directly hitting the monitor screen. I am also interested in what the
light level should be to judge brightness contrast and color on screen.
The cost of the bulb is pretty much in line with what I paid for a
non-photographic bulb from the hardware store that was less but was only 30
watts. I have replaced most of if not all of the bulbs in my house with
CFL's and sure enough my electric bill is less then it was. I mostly like
the look of the fixture at Ikea when we where there We tend to visit one of
their stores about twice a month. Most of their fixtures have the
recomendation of the 11 watt lamp but have much larger bulbs in them for
the display. I bought them for hanging lamps I made for the bedroom out of
parts from Ikea but replaced the bulbs with 20watt ones as the 11watt globe
bulbs were not bright enoungh. John
> [Original Message]
> From: Andrew Fildes <afildes@xxxxxxxxxxxxx>
> To: Olympus Camera Discussion <olympus@xxxxxxxxxxxxxxxxx>
> Date: 1/18/2010 12:00:23 AM
> Subject: Re: [OM] Lighting for a computer work area
>
> I'd expect to pay more than that for 40 watt cold fluoro (energy
> saver) lamp (not really a bulb is it?) - remember it has an equivalent
> output of around 150W (though quoted equivalents are usually
> optimistic in the extreme)..
> These are available in 3000degK (warm, tungsten yellow) and 5000degK
> (cool, daylight) from my local hardware superstore at more than double
> that price. For viewing a computer screen, I'd recommend cool lamps.
> The strongest usually used in a domestic room is 18-24 watt so make
> sure it's not too powerful!
> The IKEA fitting has a max rating of 40W STANDARD BULB for heat
> dissipation reasons. The energy saver lamp is far more powerful but
> does not get hot - just a bit warm - so that shouldn't be a problem.
> (They recommend and 11W lamp of this type, 60W equivalent). But why
> kill most of the light with a big metal shade? And it needs a special
> fitting. If you have what we call a batten fitting on the ceiling
> (basically just a light socket with a collar attached directly to the
> ceiling) then you can fit a globe and cheap flat cone shade to it and
> throw a lot of light across the room. Or buy a drop shade and cord
> with a plug that fits straight into the battern socket on the ceiling
> if you want to bring the light source down. (Those can be had
> cheaply). But the shade should be clear glass or metal with a cold
> white interior or you'll get some light colouring.
> Andrew Fildes
> afildes@xxxxxxxxxxxxx
>
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