LED color output is still rather bizarre, possibly always will be. CFLs
are going to be a lot closer to black body radiators but it's the nature
of phosphors that they will decay over time and the individual phosphors
won't decay at exactly the same rates so the color will vary. (To the
extent that LEDs use Phosphors to fill the curve, they will have the
same problem.) I'd say that if color is more important then CFLs will be
the preferred choice, at least if they are used in addition to fading
daylight. Where metamerism isn't as much of a factor, say in jewelry, or
where the power efficiency is more important because they are the only
source of light for many hours at a time, the LEDs will rule,
particularly if the cost of lamps comes down.
Right now CFLs are about four times as efficient as your halogens and
you lose another chunk by using small wires to turn your lighting system
into a space heater, but you don't have the loss from the inverter.
Still, the light from the halogens is pleasing and the bulbs aren't as
fragile as CFLs, although they do burn out faster.
In your place, as it sounds like you aren't going to be using them a
lot, I'd just rewire to eliminate the voltage drop and fire hazard.
The real winner could be LEDs that have decent CRI and run on 12 VDC,
eliminating the weight and cost of both the inverter and the power
supply in the lamp, particularly as the theoretical limit to efficiency
of LEDs is almost three times as great as fluorescents. I don't think
these bulbs exist yet. Our grandchildren will use DC LEDs and the power
reduction will let them run them off lithium cells, or maybe even fuel
cells, so they can eliminate the battery mass. Or it could be faster. I
still clearly remember using carbon arc lamps on a process camera and
for exposing screens and plates, a quarter century brings a whole lot of
change.
Van
On 07/05/2011 4:52 AM, James Parker wrote:
>
> Thanks for the calculations, Van! I can see why the cables get hot.
> This system is pretty much retired anyway, for the reasons stated. It
> would be a lot more efficient with LEDs, that draw less current. I
> never did the W/V=A calculation on this, just counted up the wattage
> on the bulbs. Obviously, that's the source of the heat build-up! My
> bad. With my engineering background, I should have figured this out.
>
> I've seen people running two or three large CFLs as general ambient
> lighting, too. Both CFLs and LEDs draw less current, but I suspect the
> LEDs have better color temperature consistency over time. Any thoughts
> on this?
>
> Jim Parker
> parkerparker :: design | photography
> http://www.parkerparker.info
> @dakkid / twitter
>
--
----------------------------------------------------------
Sign up now for Quotes of the Day, a handful of quotations
on a theme delivered every morning.
Enlightenment! Daily, for free!
mailto:twisted@whidbey.com?subject=Subscribe_QOTD
For photography, web design, hosting, and maintenance,
visit Van's home page: http://www.domainvanhorn.com/van/
----------------------------------------------------------
[Non-text portions of this message have been removed]
http://artshowphoto.com/support.htm
PLEASE READ....PLEASE TRIM POSTS!!! Keep quoted material short.
Repeat or create accurate subject lines.
If you want to advertise services related to art shows or photography, either in a forum post or on the resource web site, please contact the forum owner for permission.
Resource web site at
http://ArtShowPhoto.com
0 comments:
Post a Comment