31 Days till OSH

The reason that there aren't white LED lamps is the same reason that
there aren't battery-electric airplanes. Right now, for "white"
light, fluorescent lamps are just about the most efficient thing
around. To make money, LEDs have to beat fluorescents and they aren't
quite there yet - but probably will get there within the next few years.



Matt Roberds

Matt,

Actually, that's not quite true. LEDs have just hit efficiencies of
90 lumens per watt, which is comparable to compact fluorescent. The
biggest barrier to LED light bulbs right now is cost, but that should
also change soon.

Dean

"Dan Luke" wrote in message
...
When you're 60, a year lasts about 20 minutes.
--
Dan

LOL!
Crash Lander
--
http://straightandlevel1973.spaces.live.com/
I'm not always right,
But I'm never wrong!

When you're 60, a year lasts about 20 minutes.

Hell, it's already that way at 48.
--
Jay Honeck
Iowa City, IA
Pathfinder N56993
www.AlexisParkInn.com
"Your Aviation Destination"

Jay Honeck wrote:
The grounds opened today

Time to start planning the schedule too. The forum times are up at
http://www.airventure.org/forums/

To make it easier for everyone, here's a couple to put in your planners
right away:

http://www.airventure.org/forums/pre...resenterID=673

Date Time Location Short Title
7/23 1:00 PM - 2:15 PM 09 Honda Generator Solar Electrics for The
Hangar- Update on Homemade Strobe Lights
7/25 10:00 AM - 11:15 AM 10 Poly-Fiber Technology & Research
The Best Avionics

Presenter: Jim Weir is the CEO and Chief Engineer of RST Engineering
which he founded in 1974. He is an author of over 200 articles on
electronics design and avionics. Jim worked on the Rutan Voyager program
designing antenna systems, engine instrumentation and fuel timing
devices. Prior to starting RST Engineering Jim was involved in
developing RF systems for Viking, Apollo and Surveyor. Jim is also a
part-time professor in electronics at Sierra College and was selected
"Teacher of the Year" in 2000.

It looks like Jim's got to use a bit of sunscreen before taking the
publicity photo that was used on that page though.

Morgans wrote:
wrote
Lamp geeks will talk about color temperature in degrees Kelvin, like
"2800 K". Fluorescent lamps are sometimes marked this way, but sometimes
they use a code like "28" for 2800 K, "30" for 3000 K, and sometimes
aren't marked at all.

Check again, now. Most of the fluorescents I see at Lowe's DO have the
Kelvin temperature on the package.

I was at Home Depot the other day and it was indeed marked on most of
the CFLs they sold. It wasn't on the front in the little "lumens/watts/
hours" box (where I think it should go), but it _was_ printed on the back.
The "nvision" brand had three different color temperatures available and
the packages were printed in different colors on a white background. IIRC
red was "soft white" and about 2800 K; green was "bright white" and about
3500 K, and blue was "sunlight" or "daylight" and about 5500 K.

Matt Roberds

wrote:
wrote:
The reason that there aren't white LED lamps is the same reason that
there aren't battery-electric airplanes. Right now, for "white"
light, fluorescent lamps are just about the most efficient thing
around. To make money, LEDs have to beat fluorescents and they aren't
quite there yet - but probably will get there within the next few years.

Actually, that's not quite true. LEDs have just hit efficiencies of
90 lumens per watt, which is comparable to compact fluorescent.

In a lab, with a junction temperature of 25 C (in other words, on a heat
sink with Freon running through it.) 90 lm/W in an LED lamp that
your grandmother can buy and install in her kitchen is still a ways off.
I have no doubt it's coming but it's not here yet.

Matt Roberds

blush

There must be some mistake. I haven't given a forum in fifteen years
without being up against either Burt Rutan, Rod Machado, Dick Rutan, or Mike
Melville. What is going on with scheduling this year? {;-)

Jim

--
"Life is not a journey to the grave with the intention of arriving safely in
a pretty and well preserved body, but rather to skid in broadside,
thoroughly used up, totally worn out, with chocolate in one hand and wine in
the other, loudly proclaiming 'WOO HOO What a Ride!'"
--Unknown


"Paul Dow (Remove Caps in mail address)" wrote in
message ...


Date Time Location Short Title
7/23 1:00 PM - 2:15 PM 09 Honda Generator Solar Electrics for The Hangar-
Update on Homemade Strobe Lights
7/25 10:00 AM - 11:15 AM 10 Poly-Fiber Technology & Research
The Best Avionics

Presenter: Jim Weir

wrote:
The reason that there aren't white LED lamps is the same reason that
there aren't battery-electric airplanes. Right now, for "white"
light, fluorescent lamps are just about the most efficient thing
around. To make money, LEDs have to beat fluorescents and they aren't
quite there yet - but probably will get there within the next few years.

Actually, that's not quite true. LEDs have just hit efficiencies of
90 lumens per watt, which is comparable to compact fluorescent.

According to Klipstein (probably the most knowledgeable person on the
subject of lighting that I know) CFLs are still down at around 55-60 lm/w.
Only 32FT8 fluorescents are up in the 90+ lm/w range. (See upcoming
November KP article or the Monday Oshkosh forum.)

The below by Matt is also true. Lab conditions and home workshops are not
in the same league.

Jim


In a lab, with a junction temperature of 25 C (in other words, on a heat
sink with Freon running through it.) 90 lm/W in an LED lamp that
your grandmother can buy and install in her kitchen is still a ways off.
I have no doubt it's coming but it's not here yet.

Matt Roberds

On Jun 23, 3:58 am, Thomas Borchert
wrote:
Dan,

OK, it's probably too late this year...how about next year?

I've been twice - and I can't wait to go again. It's just a lot of
effort coming from Germany.

--
Thomas Borchert (EDDH)


My son and I will be coming this year from Wuxi, China (6,920
miles :^). Plan to arrive OSH either Tuesday or Wednesday and will
bring a case of Tsingtao if my wife lets me load up the suitcase. Am
leaving the Velocity parked in long-term storage but will try to
arrive in my dad's Mooney. What are the chances of getting into "the
show" on Tuesday and/or Wednesday?

Jeff

On Jun 25, 12:50 pm, wrote:
wrote:
wrote:
The reason that there aren't white LED lamps is the same reason that
there aren't battery-electric airplanes. Right now, for "white"
light, fluorescent lamps are just about the most efficient thing
around. To make money, LEDs have to beat fluorescents and they aren't
quite there yet - but probably will get there within the next few years.

Actually, that's not quite true. LEDs have just hit efficiencies of
90 lumens per watt, which is comparable to compact fluorescent.

In a lab, with a junction temperature of 25 C (in other words, on a heat
sink with Freon running through it.) 90 lm/W in an LED lamp that
your grandmother can buy and install in her kitchen is still a ways off.
I have no doubt it's coming but it's not here yet.

Matt Roberds

If you say so...