Re: LED lights


Tony Rothwell
 

Jim,

The 50 W Halogen bulbs in my winglets are what they call dichroic; the light goes out the front - the heat goes out the back;  and they DO get very hot.
They are in a sealed compartment simply carved out of the lower winglet foam , a lightweight Al bracket and a bit of heat moulded acrylic as a cover.
Behind the bulb and to protect the blue foam from heat, I have a tiny square of fiberfrax.  No heat damage in many years of use (including hot daytime use as wig wag lights).
LED lights run much, much cooler and as I mentioned earlier, well designed ones come with internal heat management, to protect the LED electronics not anything external.

Tony


On Sat, 16 May 2020 at 09:24, Jim Evans <jevansez@...> wrote:
It seems like y'all are finally getting around to addressing my original question. It appears in order to get to the required brightness needed for landing light, will have to deal with unwanted heat which makes using them anywhere near wing foam such as winglets a significant challenge. Which goes back to my original question, how do you deal with the heat?

Jim

On Fri, May 15, 2020, 19:02 Tony Rothwell <tony13rothwell@...> wrote:
Del,
I agree that power consumption comparisons are interesting for LED lights but the missing link is the rapidly improving amount of light output per electrical watt consumed.
Consider how much light some of the so called headband head-light LED things put out - and the lights on push bikes.
That said, I am not sure how much reliance to place on some of the quoted Lumens figures - some LED's with relatively low numbers seem a lot brighter than those with higher claimed outputs.
     Perhaps a manufacturer honesty measure?
I would like to replace my halogen wing tip lights with push bike LED's but the clever internal switching arrangements have made that not such a simple task.
There is another clever wrinkle to these high power LED's too - the manufacturers build in heat protection circuits which actually switch the LED on and off to keep heat within limits.
Because of the persistence of the eye we do not notice this happening but it does and it introduces RF energy to the wiring.
But when it is all added up, LED's are getting better every day and are the way to go.

On Sat, 16 May 2020 at 08:35, Del Schier <cozypilot@...> wrote:

Those $14 LED’s are rated at 140 mA, only 2 watts.  The $13 LED’s I used in my Cozy are 36 watts for the pair. They are rated at  2600 Lumens so assuming the same efficiency those Crazed lights are only about 150 Lumens!  

 

The $210 PAR36 LED lights that ACS sells are rated at 14 watts and have a rating of 10,400 Luminous Flux. Not sure what to make of that rating.

 

The standard GE Halogen bulbs are 48 watts and 100,000 candlepower (converts to 7900 lumens}; go figure……….  Maybe we are comparing apples and oranges, but I think comparing LEDs by power means something.  How the beam is focused seems important also.

 

Del Schier

Cozy IV N197DL

Cannon Creek Airpark 15FL

 

 

 

From: members@canardzone.groups.io <members@canardzone.groups.io> On Behalf Of Greg Norman
Sent: Friday, May 15, 2020 9:51 AM
To: members@canardzone.groups.io
Subject: Re: [Canard Zone] LED lights

 

Read the disclaimer before wasting your time and money. Fun add-on I suppose.

 

Greg Norman

 

On Mon, May 11, 2020, 10:16 PM Ian Huss via groups.io <lisnion=yahoo.com@groups.io> wrote:

Hi Tom, 

 

Did you use theCrazed pilot Bullet LED PAIR - Tiny High Output Landing/Strobe Lights or LED Lights  ?

 

$14.00

Bullet LED PAIR - Tiny High Output Landing/Strobe Lights or LED Lights

We manufacture and sell aircraft parts and accessories for general aviation pilots and airplane builders. From c...

 

 

 They look great but do you think they put out enough light for landing (250 lumens each)? I bet they're fine for taxiing, but landings too? The wigwag controller is a bonus too! Now I gotta figure out where to put yet another switch.

 

Thanks a bunch, I remember seeing your writeup before but couldn't remember where.

 

Ion



 

Re: LED lights
From: Tom Smith
Date: Mon, 11 May 2020 12:02:04 MDT

Yes I sent them both ways. They are from crazedpilot.com

 

 

Tom Smith  A&P/IA
Long-EZ N12TS
Cell-707-592-0869
KVCB
KJ6PZN

 

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