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LED strip lighting for panels

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nuckolls.bob(at)aeroelect
Guest

Posted: Tue Apr 02, 2013 11:14 am Post subject: LED strip lighting for panels

If your airplane has a glare shield, you can

 consider the used of LED strip lights similar

 to these.



  http://tinyurl.com/c3wozbj



 These strips are assembled from an array

 of LED trios in series fitted with the appropriate

 series resistor to provide max illumination with

 12vdc applied. Each trio occupies about 2" of

 length.



 Three white lights in series do not begin to

 output until applied voltage rises to 7.5 volts

 or so.  At 12 volts, each group of 3 lamps

 (about 2" in length) draws about 25 milliamps.



 Assume you need 36" of strip to stretch

 across the glare shield (18 trios). You'll

 need a dimmer control capable of carrying

 18 x .025 or 0.45 amps. This relatively

 low current draw makes the noise-free, linear

 regulators more attractive. Referring to this

 drawing



  http://tinyurl.com/ccrpzfa



 You see the architecture for a dimmer set up for

 incandescent lamps. I.e. 4.5 volts minimum. For service

 with these strips, the minimum needs to be raised to

 7.5 volts. Further, we want to fix the adjustment

 range at 7.5 - 12v or a delta-V of 3.5 volts.



 Since our stock "pot" is 2.5K, then to get 3.5

 volts dropped across the pot at max resistance,

 we need a divider current of 3.5/2500 or 1.4 milliamps.



 The voltage across the upper resistor is fixed at

 1.25 volts by internal characteristics of the

 317 regulator. 1.25V/0.0014A = 892 (910 ohms

 is close enough and a standard 5% value).



 Okay, with the pot at min resistance, we need

 7.5 volts total output. (7.5 - 1.25)/0.0014

 equals 4464 ohms (4700 is also a standard

 value and sufficiently close).



 So, if you'd care to build your own dimmer the

 390 ohm resistor is replaced with a 910 ohm

 resistor; the 910 ohm resistor is replaced with

 a 4700 ohm resistor. The TO220 plastic package

 version of the LM317 on a modicum of heatsink

 would be 'fat' enough and entirely free of noise.



 That 15-foot chunk of strip lighting for $20 is

 delivered toyour door at that price and is probably

 enough lighting to do 5 airplanes. I've copied B&C

 on this posting to see if they'd be interested in

 offering an LED strip light version of their DIM5-14

 product.



  http://tinyurl.com/dylkufj



 

   Bob . . .    [quote][b]

raymondj(at)frontiernet.n
Guest

Posted: Tue Apr 02, 2013 11:35 am Post subject: LED strip lighting for panels

Bob,

         

         Do I understand correctly that             you are controlling LED brightness by varying the voltage?

                             

                             My understanding was that a                               PWM was needed to dim LEDs.  Of course, I've                                   been wrong before. :>)

                                   	  Quote: 	
		  Raymond Julian

Kettle River, MN.



"And you know that I could have me a million more friends,

and all I'd have to lose is my point of view." - John Prine 	
       On 04/02/2013 02:12 PM, Robert L. Nuckolls, III wrote:

     

     [quote]       If your airplane has a glare shield, you can

       consider the used of LED strip lights similar

       to these.

       

                http://tinyurl.com/c3wozbj

         

       These strips are assembled from an array

       of LED trios in series fitted with the appropriate

       series resistor to provide max illumination with

       12vdc applied. Each trio occupies about 2" of

       length.

       

       Three white lights in series do not begin to

       output until applied voltage rises to 7.5 volts

       or so.  At 12 volts, each group of 3 lamps

       (about 2" in length) draws about 25 milliamps.

       

       Assume you need 36" of strip to stretch

       across the glare shield (18 trios). You'll

       need a dimmer control capable of carrying

       18 x .025 or 0.45 amps. This relatively

       low current draw makes the noise-free, linear

       regulators more attractive. Referring to this

       drawing

       

                http://tinyurl.com/ccrpzfa

       

       You see the architecture for a dimmer set up for

       incandescent lamps. I.e. 4.5 volts minimum. For service

       with these strips, the minimum needs to be raised to

       7.5 volts. Further, we want to fix the adjustment

       range at 7.5 - 12v or a delta-V of 3.5 volts.

       

       Since our stock "pot" is 2.5K, then to get 3.5

       volts dropped across the pot at max resistance,

       we need a divider current of 3.5/2500 or 1.4 milliamps.

       

       The voltage across the upper resistor is fixed at

       1.25 volts by internal characteristics of the

       317 regulator. 1.25V/0.0014A = 892 (910 ohms

       is close enough and a standard 5% value).

       

       Okay, with the pot at min resistance, we need

       7.5 volts total output. (7.5 - 1.25)/0.0014

       equals 4464 ohms (4700 is also a standard

       value and sufficiently close).

       

       So, if you'd care to build your own dimmer the

       390 ohm resistor is replaced with a 910 ohm

       resistor; the 910 ohm resistor is replaced with

       a 4700 ohm resistor. The TO220 plastic package

       version of the LM317 on a modicum of heatsink

       would be 'fat' enough and entirely free of noise.

       

       That 15-foot chunk of strip lighting for $20 is

       delivered toyour door at that price and is probably

       enough lighting to do 5 airplanes. I've copied B&C

       on this posting to see if they'd be interested in

       offering an LED strip light version of their DIM5-14

       product.

       

                http://tinyurl.com/dylkufj

         

                

             Bob . . .                   	  Quote: 	
		  

	
       [b]

FisherPaulA(at)johndeere.
Guest

Posted: Tue Apr 02, 2013 11:42 am Post subject: LED strip lighting for panels

I’m doing exactly that in my plane using red LED’s instead of white.  I’ve got them installed by not wired yet (been too cold at the hanger!).  I’m planning to  use one of Eric’s dimmers (http://www.periheliondesign.com/egpavr.htm).  I’ve tested the lights and dimmer in the shop and it all seems to work well.   I’ll have to wait for some dark night to see how  effective they actually are in the plane.  I’m actually more concerned about having too much light.  But so far it appears that I can dial it down far enough to not overpower my night vision. 

  

Paul A. Fisher 

RV-7A N18PF 

  

    

From: owner-aeroelectric-list-server(at)matronics.com [mailto:owner-aeroelectric-list-server(at)matronics.com] On Behalf Of Robert L. Nuckolls, III

 Sent: Tuesday, April 02, 2013 2:12 PM

 To: aeroelectric-list(at)matronics.com

 Subject: LED strip lighting for panels 

 

 

  

If your airplane has a glare shield, you can

 consider the used of LED strip lights similar

 to these.

 

 http://tinyurl.com/c3wozbj

 

 … snip … [quote] [b]

nuckolls.bob(at)aeroelect
Guest

Posted: Tue Apr 02, 2013 12:08 pm Post subject: LED strip lighting for panels

At 02:35 PM 4/2/2013, you wrote:

  	  Quote: 	
		  Bob,



 Do I understand correctly that you are controlling LED brightness by varying the voltage?



 My understanding was that a PWM was needed to dim LEDs.  Of course, I've been wrong before. :>) 	


   Not necessarily. The LED strip lights come with resistors

   built in . . . these resistors combined with

   minimum voltage necessary to get first light offers

   an opportunity to dim either way. You wouldn't necessarily

   want to do this to 'dim' high power leds . . . but the sum

   total of power for a few feet of strip lets us consider

   the linear, noise free option. 



 

   Bob . . .    [quote][b]

fvalarm(at)rapidnet.net
Guest

Posted: Tue Apr 02, 2013 12:33 pm Post subject: LED strip lighting for panels

I used very similar lighting strips in my RV7A.  At the  the time the only place I found them was on Ebay from HongKong, but shipping was  cheap.  These work well with a two channel dimmer I already had from  Steinair.  One channel is used for the incandescent and the other for the  LED strips as they dim as a different rate.  I'm very happy with the  results and would have bought from  B n C if they stocked  it.

  

 I would also have bought the dropping resistors from B no for  the wigwag flasher but they don't stock them.  nudge  nudge.

  

 Bevan

  

  



   From:  owner-aeroelectric-list-server(at)matronics.com  [mailto:owner-aeroelectric-list-server(at)matronics.com] On Behalf Of Robert  L. Nuckolls, III

Sent: Tuesday, April 02, 2013 12:12 PM

To:  aeroelectric-list(at)matronics.com

Subject: LED strip  lighting for panels

 

If your airplane has a glare shield, you can

consider the used of  LED strip lights similar

to these.



http://tinyurl.com/c3wozbj



These strips are  assembled from an array

of LED trios in series fitted with the  appropriate

series resistor to provide max illumination with

12vdc  applied. Each trio occupies about 2" of

length.



Three white lights in  series do not begin to

output until applied voltage rises to 7.5 volts

or  so.  At 12 volts, each group of 3 lamps

(about 2" in length) draws about  25 milliamps.



Assume you need 36" of strip to stretch

across the glare  shield (18 trios). You'll

need a dimmer control capable of carrying

18 x  .025 or 0.45 amps. This relatively

low current draw makes the noise-free,  linear

regulators more attractive. Referring to this

drawing



http://tinyurl.com/ccrpzfa



You see the architecture  for a dimmer set up for

incandescent lamps. I.e. 4.5 volts minimum. For  service

with these strips, the minimum needs to be raised to

7.5 volts.  Further, we want to fix the adjustment

range at 7.5 - 12v or a delta-V of 3.5  volts.



Since our stock "pot" is 2.5K, then to get 3.5

volts dropped  across the pot at max resistance,

we need a divider current of 3.5/2500 or  1.4 milliamps.



The voltage across the upper resistor is fixed at

1.25  volts by internal characteristics of the

317 regulator. 1.25V/0.0014A = 892  (910 ohms

is close enough and a standard 5% value).



Okay, with the pot  at min resistance, we need

7.5 volts total output. (7.5 -  1.25)/0.0014

equals 4464 ohms (4700 is also a standard

value and  sufficiently close).



So, if you'd care to build your own dimmer  the

390 ohm resistor is replaced with a 910 ohm

resistor; the 910 ohm  resistor is replaced with

a 4700 ohm resistor. The TO220 plastic  package

version of the LM317 on a modicum of heatsink

would be 'fat'  enough and entirely free of noise.



That 15-foot chunk of strip lighting  for $20 is

delivered toyour door at that price and is probably

enough  lighting to do 5 airplanes. I've copied B&C

on this posting to see if  they'd be interested in

offering an LED strip light version of their  DIM5-14

product.



http://tinyurl.com/dylkufj



 

  Bob . . . [quote]



href="http://www.matronics.com/Navigator?AeroElectric-List">http://www.matronics.com/Navigator?AeroElectric-List

href="http://forums.matronics.com">http://forums.matronics.com

href="http://www.matronics.com/contribution">http://www.matronics.com/c

[b]

Gilles.Thesee(at)ac-greno
Guest

Posted: Tue Apr 02, 2013 2:41 pm Post subject: LED strip lighting for panels

Robert L. Nuckolls, III a écrit :

 	  Quote: 	
		   If your airplane has a glare shield, you can

 consider the used of LED strip lights similar

 to these.


	


Hi Bob and all,



Just for the fun, this is what we did.

(Hope attachments are allowed).



Best regards,

-- 

Gilles

http://contrails.free.fr

lighted_panel.jpg

Description:

Filesize:

29.12 KB

Viewed:

4093 Time(s)

bicyclop(at)pacbell.net
Guest

Posted: Thu Apr 04, 2013 11:29 am Post subject: LED strip lighting for panels

Bob,

     

     Is the DIM5-14 the same item as in your drawing and can be modified     for dimming the led strip lights by replacing resistors as you     suggest?

     

     Ed Holyoke

     

     On 4/2/2013 12:12 PM, Robert L. Nuckolls, III wrote:     [quote]       If your airplane has a glare shield, you can

       consider the used of LED strip lights similar

       to these.

       

                http://tinyurl.com/c3wozbj

         

       These strips are assembled from an array

       of LED trios in series fitted with the appropriate

       series resistor to provide max illumination with

       12vdc applied. Each trio occupies about 2" of

       length.

       

       Three white lights in series do not begin to

       output until applied voltage rises to 7.5 volts

       or so.  At 12 volts, each group of 3 lamps

       (about 2" in length) draws about 25 milliamps.

       

       Assume you need 36" of strip to stretch

       across the glare shield (18 trios). You'll

       need a dimmer control capable of carrying

       18 x .025 or 0.45 amps. This relatively

       low current draw makes the noise-free, linear

       regulators more attractive. Referring to this

       drawing

       

                http://tinyurl.com/ccrpzfa

       

       You see the architecture for a dimmer set up for

       incandescent lamps. I.e. 4.5 volts minimum. For service

       with these strips, the minimum needs to be raised to

       7.5 volts. Further, we want to fix the adjustment

       range at 7.5 - 12v or a delta-V of 3.5 volts.

       

       Since our stock "pot" is 2.5K, then to get 3.5

       volts dropped across the pot at max resistance,

       we need a divider current of 3.5/2500 or 1.4 milliamps.

       

       The voltage across the upper resistor is fixed at

       1.25 volts by internal characteristics of the

       317 regulator. 1.25V/0.0014A = 892 (910 ohms

       is close enough and a standard 5% value).

       

       Okay, with the pot at min resistance, we need

       7.5 volts total output. (7.5 - 1.25)/0.0014

       equals 4464 ohms (4700 is also a standard

       value and sufficiently close).

       

       So, if you'd care to build your own dimmer the

       390 ohm resistor is replaced with a 910 ohm

       resistor; the 910 ohm resistor is replaced with

       a 4700 ohm resistor. The TO220 plastic package

       version of the LM317 on a modicum of heatsink

       would be 'fat' enough and entirely free of noise.

       

       That 15-foot chunk of strip lighting for $20 is

       delivered toyour door at that price and is probably

       enough lighting to do 5 airplanes. I've copied B&C

       on this posting to see if they'd be interested in

       offering an LED strip light version of their DIM5-14

       product.

       

                http://tinyurl.com/dylkufj

         

                

             Bob . . .                   	  Quote: 	
		  

	
       [b]

wynaire(at)citlink.net
Guest

Posted: Thu Apr 04, 2013 12:15 pm Post subject: LED strip lighting for panels

FWIW: There are Ebay sites {China} now offering inexpensive LED dimmers, for stirp lighting. One is one it's way here. If it smokes, I will post the peticulars. As always, thanks for your advice. 

 Mike W.

 PS: Now looking for an "inexpensive" CS prop governor for a Lyc IO-360 AV. Anyone building one in his  shop? )

 ***********

 

  	  Quote: 	
		      

From: Ed Holyoke <bicyclop(at)pacbell.net>

To: aeroelectric-list(at)matronics.com 

Sent: Thursday, April 4, 2013 1:29 PM

Subject: Re: AeroElectric-List: LED strip lighting for panels

  Bob,



Is the DIM5-14 the same item as in your drawing and can be modified for dimming the led strip lights by replacing resistors as you suggest?



Ed Holyoke



On 4/2/2013 12:12 PM, Robert L. Nuckolls, III wrote:   	  Quote: 	
		  If your airplane has a glare shield, you can

consider the used of LED strip lights similar

to these.



http://tinyurl.com/c3wozbj



These strips are assembled from an array

of LED trios in series fitted with the appropriate

series resistor to provide max illumination with

12vdc applied. Each trio occupies about 2" of

length.



Three white lights in series do not begin to

output until applied voltage rises to 7.5 volts

or so.  At 12 volts, each group of 3 lamps

(about 2" in length) draws about 25 milliamps.



Assume you need 36" of strip to stretch

across the glare shield (18 trios). You'll

need a dimmer control capable of carrying

18 x .025 or 0.45 amps. This relatively

low current draw makes the noise-free, linear

regulators more attractive. Referring to  this

drawing



http://tinyurl.com/ccrpzfa



You see the architecture for a dimmer set up for

incandescent lamps. I.e. 4.5 volts minimum. For service

with these strips, the minimum needs to be raised to

7.5 volts. Further, we want to fix the adjustment

range at 7.5 - 12v or a delta-V of 3.5 volts.



Since our stock "pot" is 2.5K, then to get 3.5

volts dropped across the pot at max resistance,

we need a divider current of 3.5/2500 or 1.4 milliamps.



The voltage across the upper resistor is fixed at

1.25 volts by internal characteristics of the

317 regulator. 1.25V/0.0014A = 892 (910 ohms

is close enough and a standard 5% value).



Okay, with the pot at min resistance, we need

7.5 volts total output. (7.5 - 1.25)/0.0014

equals 4464 ohms (4700 is also a standard

value and sufficiently close).



So, if you'd care to build your own dimmer the

390 ohm resistor is replaced with a 910  ohm

resistor; the 910 ohm resistor is replaced with

a 4700 ohm resistor. The TO220 plastic package

version of the LM317 on a modicum of heatsink

would be 'fat' enough and entirely free of noise.



That 15-foot chunk of strip lighting for $20 is

delivered toyour door at that price and is probably

enough lighting to do 5 airplanes. I've copied B&C

on this posting to see if they'd be interested in

offering an LED strip light version of their DIM5-14

product.



http://tinyurl.com/dylkufj



   Bob . . . 

 	  Quote:

holger-d(at)shadowbrush.c
Guest

Posted: Thu Apr 04, 2013 1:28 pm Post subject: LED strip lighting for panels

I have two of those $6 dimmers on order also. Others have already reported success using them in the RV forum. 



Holger



On Apr 4, 2013, at 10:14 PM, wynaire(at)citlink.net (wynaire(at)citlink.net) wrote:

[quote]FWIW: There are Ebay sites {China} now offering inexpensive LED dimmers, for stirp lighting. One is one it's way here. If it smokes, I will post the peticulars. As always, thanks for your advice. 

 Mike W.

 PS: Now looking for an "inexpensive" CS prop governor for a Lyc IO-360 AV. Anyone building one in his  shop? )

 ***********

[b]

crabandy(at)yahoo.com
Guest

Posted: Thu Apr 04, 2013 1:28 pm Post subject: LED strip lighting for panels

This is what was recommended by other builders, Kick KR6 $15-$20 on ebay. I haven't "fired" it up yet....

 http://www.kicklighting.com/Kick-Lighting-KR6.pdf

 



    

From: "wynaire(at)citlink.net" <wynaire(at)citlink.net>

To: "aeroelectric-list(at)matronics.com" <aeroelectric-list(at)matronics.com> 

Sent: Thursday, April 4, 2013 3:14 PM

Subject: Re: LED strip lighting for panels

    FWIW: There are Ebay sites {China} now offering inexpensive LED dimmers, for stirp lighting. One is one it's way here. If it smokes, I will post the peticulars. As always, thanks for your advice. 

 Mike W.

 PS: Now looking for an "inexpensive" CS prop governor for a Lyc IO-360 AV. Anyone building one in his  shop? )

 ***********

 

 [quote]    

From: Ed Holyoke <bicyclop(at)pacbell.net>

To: aeroelectric-list(at)matronics.com 

Sent: Thursday, April 4, 2013 1:29 PM

Subject: Re: LED strip lighting for panels

  Bob,



Is the DIM5-14 the same item as in your drawing and can be modified for dimming the led strip lights by replacing resistors as you suggest?



Ed Holyoke



On 4/2/2013 12:12 PM, Robert L. Nuckolls, III wrote:   	  Quote: 	
		  If your airplane has a glare shield, you can

consider the used of LED strip lights similar

to these.



http://tinyurl.com/c3wozbj



These strips are assembled from an array

of LED trios in series fitted with the appropriate

series resistor to provide max illumination with

12vdc applied. Each trio occupies about 2" of

length.



Three white lights in series do not begin to

output until applied voltage rises to 7.5 volts

or so.  At 12 volts, each group of 3 lamps

(about 2" in length) draws about 25 milliamps.



Assume you need 36" of strip to stretch

across the glare shield (18 trios). You'll

need a dimmer control capable of carrying

18 x .025 or 0.45 amps. This relatively

low current draw makes the noise-free, linear

regulators more attractive. Referring to  this

drawing



http://tinyurl.com/ccrpzfa



You see the architecture for a dimmer set up for

incandescent lamps. I.e. 4.5 volts minimum. For service

with these strips, the minimum needs to be raised to

7.5 volts. Further, we want to fix the adjustment

range at 7.5 - 12v or a delta-V of 3.5 volts.



Since our stock "pot" is 2.5K, then to get 3.5

volts dropped across the pot at max resistance,

we need a divider current of 3.5/2500 or 1.4 milliamps.



The voltage across the upper resistor is fixed at

1.25 volts by internal characteristics of the

317 regulator. 1.25V/0.0014A = 892 (910 ohms

is close enough and a standard 5% value).



Okay, with the pot at min resistance, we need

7.5 volts total output. (7.5 - 1.25)/0.0014

equals 4464 ohms (4700 is also a standard

value and sufficiently close).



So, if you'd care to build your own dimmer the

390 ohm resistor is replaced with a 910  ohm

resistor; the 910 ohm resistor is replaced with

a 4700 ohm resistor. The TO220 plastic package

version of the LM317 on a modicum of heatsink

would be 'fat' enough and entirely free of noise.



That 15-foot chunk of strip lighting for $20 is

delivered toyour door at that price and is probably

enough lighting to do 5 airplanes. I've copied B&C

on this posting to see if they'd be interested in

offering an LED strip light version of their DIM5-14

product.



http://tinyurl.com/dylkufj



   Bob . . . 

 	  Quote: 	
		  

	


	






[b]

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