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wynaire(at)citlink.net
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 Posted: Sun Jan 27, 2013 11:02 am Post subject: LED light experiment |
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Hello Eric,
Many thanks for the "hand-holding exercise." I envy your expertise. What [project] seemed simple becomes a bit complicated, though doable, I hope.
This morning my experimenting led to placing a white [6000k] 10 watt LED being a FAA nav green (blue) glass lens. The resultant visible color was not even close to green. Thanks for the tip on the FAA wanting a specific color in wavelengths. At least I know where to start, once back in the lab (basement shop).
At least so far, I have the white strobe light (color) nailed down. That's a start!
Do you [or anyone reading this] have a suggestion as to how to best measure lumens? Would an older type of photo light-meter work in this case, held a set distance for each test?
As well, does any one know why the LED manufacturers use a "flexible clear colloid" to cover the active LED material? Is this an inexpensive way to seal the active material, or something else? I want to mount the end of a polished acrylic rod as close as possible to a LED, for light transmission. This colloid material is fragil. Several LED OEM's have not responded to this question.
My best regards,
Mike
Moab, UT
***********
[quote] ---
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Eric M. Jones
Joined: 10 Jan 2006
Posts: 565
Location: Massachusetts
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| Posted: Mon Jan 28, 2013 6:35 am Post subject: Re: LED light experiment |
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| Quote: | | This morning my experimenting led to placing a white [6000k] 10 watt LED being a FAA nav green (blue) glass lens. The resultant visible color was not even close to green. Thanks for the tip on the FAA wanting a specific color in wavelengths. At least I know where to start, once back in the lab (basement shop). |
Mike, The FAA filter is bluish because the original incandescent lamp was yellowish. Bluish + yellowish equals aviation greenish. Abandon any hope of filtering LEDs to get other colors. If you want green, buy 525 nm green. Read my paper on red-green position lights. Learn how to say "spatial distribution".
| Quote: | | At least so far, I have the white strobe light (color) nailed down. That's a start! |
The FAA still likes neon red too. And red has some advantages in LED strobes. Read my paper on LED strobes.
| Quote: | | Do you [or anyone reading this] have a suggestion as to how to best measure lumens? Would an older type of photo light-meter work in this case, held a set distance for each test? |
Read my paper on red-green position lights. It has a very nice and very readable description of how to do the photometry, which gets a lot of people confused.
| Quote: | | As well, does any one know why the LED manufacturers use a "flexible clear colloid" to cover the active LED material? Is this an inexpensive way to seal the active material, or something else? I want to mount the end of a polished acrylic rod as close as possible to a LED, for light transmission. This colloid material is fragile. Several LED OEM's have not responded to this question. |
"Colloid" is Chem-speak for "stuff with other stuff in it". The little LED chip gets very hot and has to be protected. Optical coupling is also the key issue. Materials used are usually high temperature acrylic and for higher temperatures, epoxies and silicones.
Mike, A lot of what you are trying has already been done for you. Read everything you can find before trying to invent new stuff. Remember, Nature give you uncountable ways to fool yourself. Science teaches how not to fool ourselves.
Good luck.
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_________________
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones(at)charter.net |
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Andrewjames
Joined: 28 Jan 2013
Posts: 2
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| Posted: Tue Jan 29, 2013 1:54 am Post subject: Re: LED light experiment |
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[quote="wynaire(at)citlink.net"]Hello Eric,
Many thanks for the "hand-holding exercise." I envy your expertise. What [project] seemed simple becomes a bit complicated, though doable, I hope.
This morning my experimenting led to placing a white [6000k] 10 watt LED being a FAA nav green (blue) glass led bulb lens. The resultant visible color was not even close to green. Thanks for the tip on the FAA wanting a specific color in wavelengths. At least I know where to start, once back in the lab (basement shop).
At least so far, I have the white strobe light (color) nailed down. That's a start!
Do you [or anyone reading this] have a suggestion as to how to best measure lumens? Would an older type of photo light-meter work in this case, held a set distance for each test?
As well, does any one know why the LED manufacturers use a "flexible clear colloid" to cover the active LED material? Is this an inexpensive way to seal the active material, or something else? I want to mount the end of a polished acrylic rod as close as possible to a LED, for light transmission. This colloid material is fragil. Several LED OEM's have not responded to this question.
My best regards,
Mike
Moab, UT
***********
Hello. I am not wellknown to led lights and you seems to be experienced person. I want to install led lights in my home. What is your suggestion?
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Last edited by Andrewjames on Tue Jan 29, 2013 11:18 pm; edited 1 time in total |
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Eric M. Jones
Joined: 10 Jan 2006
Posts: 565
Location: Massachusetts
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| Posted: Tue Jan 29, 2013 5:34 am Post subject: Re: LED light experiment |
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| Quote: | Hello. I am not well known to led lights and you seems to be experienced person. I want to install led lights in my home. What is your suggestion?
AndrewJames |
For DIYers and LED flashlights I refer people to Deal Extreme (DX.com)
For household lighting, the big-box stores are selling now. The price is high but the selection is good and getting better. By year's end it will be a whole new world for lighting.
FYI, Cree is now marketing led chips of >200 lumens/watt.
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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_________________
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones(at)charter.net |
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wynaire(at)citlink.net
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| Posted: Tue Jan 29, 2013 9:54 am Post subject: LED light experiment |
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Hi. My advice is to go to EBay.com and search for "LED lights." There are
many to chose from. Often the seller offers basic instructions for use. Good
luck,
Mike
***********
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