Digital BW, The Print

pr_roark wrote:
> Andrew Darlow <ad@...> wrote:
> 
> 
>> There also exist LED flood lights and LED MR16's,...
>>
>> Buylighting.com has a number of them.
>>
>> and here is another page full of them:
>> http://www.besthomeledlighting.com/led_floodlight
>>
> ...
> 
> I think the LEDs are clearly the future, but I'm not sure what the 
> light quality (CRI) is or whether there are appropriate sizes/lumens 
> for our replacement project.  Actually, there is a program in 
> California that is going to end up giving our gallery free lights.  
> So we have to pick from what they have, which seems to be simply a 
> selection of CF floods and 'spots' (more like floods than a halogen 
> spot).
> 
> I, too, would like to hear if anyone has experience with the LEDs.
> 
> Paul
> www.PaulRoark.com 
> 
> 

Over time I have checked the specs of LED lamps at this 
Dutch site

http://www.olino.org/
which has a more recent version in English
http://www.olino.org/us/
That may not have all data that is available on the Dutch site.
The CRI on itself doesn't tell all, check the red and blue 
samples of the specs here and that's with a total CRI of 87: 
http://www.olino.org/us/articles/2008/10/05/edison-led-3%C3%971-w-gu10-ww

None of the LED sources has the light quality of the best 
"full spectrum" fluorescents and the last do not meet the 
quality of the Solux halogens.

A friend who will shortly occupy another studio intends to 
install LED tubes there. I have warned him that the LEDS are 
not yet at the quality he needs. The economy of LED lamps 
compared to fluorescent tubes isn't better either. The pros 
of LEDs are the fast switching possible, working in any 
temperature, faster on maximum output after switching on, 
much longer life, less environmental waste than 
fluorescents, economy if compared to lamps in general. Their 
spotlight characteristic is sometimes an advantage but not 
always.

LEDs make new armature designs possible:
http://www.lighting.philips.com/in_en/applications/office/daywave.php?main=gb_en&parent=1&id=in_en_applications&lang=en
The manufacturers face the fact that consumers will buy a 
LED lamp and never return to replace that lamp so 
integrating the LEDS as much as possible in the luminaire is 
one way to let the customer return. If the design starts to 
become old fashioned the LEDS go with it.

Right now I'm replacing outdoor lamps, non color critical 
lamps etc with LED alternatives. I expect that the 12V 
halogen armatures with Solux type lamps are best right now 
for the studio and that in time better LED lamps that fit 
the same GU 5.3 armatures will become available. The larger 
part of my shop where the silkscreen printer etc is has 
about 25 Philips 950 fluorescent tubes. If possible I would 
like to exchange them with LED armature designs when their 
light quality becomes better and then use more autoswitching 
control to reduce energy waste.

Compact fluorescents like Truelight are an alternative but 
not equal in output to Solux.

-- 
Met vriendelijke groeten, Ernst


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