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#41
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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 |
#42
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31 Days till OSH
"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! |
#43
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31 Days till OSH
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" |
#44
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31 Days till OSH
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. |
#45
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31 Days till OSH
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 |
#47
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31 Days till OSH
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 |
#48
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31 Days till OSH
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 |
#49
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31 Days till OSH
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 |
#50
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31 Days till OSH
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... |
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