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1337Delta764
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Warm White, Cool White, Or Daylight Lighting?

Thu Sep 11, 2008 2:52 am

I was wondering, is there any reason why most airlines use the warm white (yellowish) lighting on their aircraft over cool white (whiter with a slight yellow tinge) or daylight (bluish-white)? I personally think daylight fluorescent lighting looks better than warm white or cool white. However, soon LED mood lighting will become standard, so that may make this point moot.

I think Delta actually now has cool white tubes on their aircraft after they refurbished the interiors of their planes. However, AirTran's 717s initially had cool white tubes but were replaced with warm white. I don't know of any airlines who have daylight fluorescent tubes.
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HAWK21M
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RE: Warm White, Cool White, Or Daylight Lighting?

Thu Sep 11, 2008 7:33 am

I guess it depends on the Airline in question & their choice.
Personally I prefer the White light.However some qoute the Warm whitel lighting as more relaxing.
Not sure I agree though  Smile

In fact The Engineering/Maintenance Cabins lightings are White light compared to the Warm/Off white lighting in other cabins,as given the choice I decided on the former & it does look better.But then these are cabins & the topic is about Aircraft,so I guess in the Aircraft one would probably want more soothing lights.



regds
MEL
I may not win often, but I damn well never lose!!! ;)
 
kimberlyRJ
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RE: Warm White, Cool White, Or Daylight Lighting?

Sun Sep 14, 2008 9:40 am

The last thing you want is the aircrafts cabin looking to bright like an office or call centre.

Relaxing is the name of the game. These days you are just as likely to find mood lighting as well as ‘entrance lighting’ (which tend to be more white or yellowish in colour’.

It’s also rumored that the bright lights can show up possible stains and mess on the seats and bulk heads – so slightly off colour lighting can hide it (this is was ground services told me at LHR) lol

I must admit I told like some of the LED lighting that can be used these days, looks a little too bright.

Kimberly.

Ps. the off colour lighting also allows me to look slightly more human at the end of a long haul flight.
 
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HAWK21M
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RE: Warm White, Cool White, Or Daylight Lighting?

Mon Sep 15, 2008 8:50 am



Quoting Kimberlyrj (Reply 2):
Relaxing is the name of the game. These days you are just as likely to find mood lighting as well as ‘entrance lighting’ (which tend to be more white or yellowish in colour’.

I guess since the threshold lighting does not focus on to the Pax...it is of a brighter colour.
also its built in with a dimmer in case the Flight deck door is opened esp on the B752.
regds
MEL
I may not win often, but I damn well never lose!!! ;)
 
Mir
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RE: Warm White, Cool White, Or Daylight Lighting?

Mon Sep 15, 2008 8:57 am

I like daylight lighting as opposed to warm yellowish lighting - makes the cabin seem more spacious and airy.

I've noticed that Airbus seems to favor the daylight lighting more than Boeing does, though that's been changing with the newer Boeing products.

-Mir
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HAWK21M
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RE: Warm White, Cool White, Or Daylight Lighting?

Tue Sep 16, 2008 9:21 am



Quoting Mir (Reply 4):
I've noticed that Airbus seems to favor the daylight lighting more than Boeing does,

Yup Watching an A320 & B737 lighting clearly shows the difference.  Smile

I guess with LED lighting that will all vary.
regds
MEL
I may not win often, but I damn well never lose!!! ;)
 
kimberlyRJ
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RE: Warm White, Cool White, Or Daylight Lighting?

Tue Sep 16, 2008 11:33 am



Quoting HAWK21M (Reply 3):
I guess since the threshold lighting does not focus on to the Pax...it is of a brighter colour.
also its built in with a dimmer in case the Flight deck door is opened esp on the B752.
regds
MEL

When I flew on the B752 the light just outside the FD door used to switch off totally when the door was open...

Brighter lights are always welcome in the galley area, helps us work and look good lol

Kimberly.
 
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HAWK21M
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RE: Warm White, Cool White, Or Daylight Lighting?

Tue Sep 16, 2008 2:43 pm



Quoting Kimberlyrj (Reply 6):
When I flew on the B752 the light just outside the FD door used to switch off totally when the door was open...

Reason is to avoid Bright light flowing through the open Flight deck door & distracting the flying crew.

Quoting Kimberlyrj (Reply 6):
Brighter lights are always welcome in the galley area, helps us work and look good lol

 Smile

regds
MEL
I may not win often, but I damn well never lose!!! ;)
 
kimberlyRJ
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RE: Warm White, Cool White, Or Daylight Lighting?

Tue Sep 16, 2008 4:56 pm



Quoting HAWK21M (Reply 7):
Reason is to avoid Bright light flowing through the open Flight deck door & distracting the flying crew.

The same happens on the Boeing 744, B763 & B772, however the lights turn off when opening the door and dim back on quite slowly when the door is shut again...

If they ever fall around with the lights by the mirror I will be complaining!

Kimberly.
 
jcs17
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RE: Warm White, Cool White, Or Daylight Lighting?

Tue Sep 16, 2008 9:39 pm

Mesaba's CRJ-900s have to have the most painful high-intensity LED white lighting ever. The fact that the lights aren't recessed at all doesn't help things. If you are boarding while it's dark outside, you almost have to grab a pair of sunglasses.
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HAWK21M
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RE: Warm White, Cool White, Or Daylight Lighting?

Wed Sep 17, 2008 10:09 am



Quoting JCS17 (Reply 9):

Mesaba's CRJ-900s have to have the most painful high-intensity LED white lighting ever.

Just wondering can LED lights be dimmed or Intensity regulated ever?
regds
MEL.
I may not win often, but I damn well never lose!!! ;)
 
rwessel
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RE: Warm White, Cool White, Or Daylight Lighting?

Wed Sep 17, 2008 8:31 pm



Quoting HAWK21M (Reply 10):
Just wondering can LED lights be dimmed or Intensity regulated ever?

Yes: It depends somewhat on the exact design, but typically you just pulse the LED with less than a 100% duty cycle to dim it. IOW, rather than driving it 100% of the time, hit it with a 1ms pulse every 10ms, and you'll get approximately a tenth the light output.

Most LEDs also respond somewhat reasonably to variations in input voltage, but the useful range tends to be somewhat limited (not to mention that the voltage/power/light output curve tends to be very steep). IOW, you may not get any light until you hit 1.5V across the device, the thing is at its rated brightness at 2V, and it's very bright and on the way to burning out at 2.3V (those are typical values for many red LEDs).

That rule gets modified somewhat if you don't have a 100% duty cycle, as in the 1ms pulse per 10ms example above, where you can often drive an LED at a rather higher than nominal voltage (with a corresponding increase in light output during that pulse), so long as the total power level over time stays below a limit. Many fairly bright LED displays work that way - the refresh sweeps short, but overpowered*, pluses through groups of LEDs over time.


*Overpowered only in the sense of what’s allowed as a continuous input - all LEDs specify both continuous and pulse limits.
 
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HAWK21M
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RE: Warm White, Cool White, Or Daylight Lighting?

Thu Sep 18, 2008 12:25 am



Quoting Rwessel (Reply 11):
Most LEDs also respond somewhat reasonably to variations in input voltage, but the useful range tends to be somewhat limited

Thanks for the Information.I guess LEDs have a long life but dimming would be restricted to an extent then.
Any plans for LED Landing lights in the future?
regds
MEL...
I may not win often, but I damn well never lose!!! ;)
 
rwessel
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RE: Warm White, Cool White, Or Daylight Lighting?

Thu Sep 18, 2008 10:46 pm



Quoting HAWK21M (Reply 12):
Thanks for the Information.I guess LEDs have a long life but dimming would be restricted to an extent then.

Apparently I was unclear. You can dim LEDs, you just don't do it by varying the input voltage, you do it by pulsing them.

Quoting HAWK21M (Reply 12):
Any plans for LED Landing lights in the future?

They already exist, or are in the works, for light aircraft.

LED-aircraft-landing-light.html" target=_blank>http://www.lunaraccents.com/applicat...ns-LED-aircraft-landing-light.html

http://www.aeroleds.com/

I imagine it's only a matter of time for airliners. We're only talking about replacing a 1000w (or so) bulb. The equivalent of ~18k lumens would require an array of no more than 30 LEDs, since 500lm LED are available off the shelf right now.
 
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HAWK21M
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RE: Warm White, Cool White, Or Daylight Lighting?

Fri Sep 19, 2008 1:48 am

LED Landing lights for airliners will be a good boost to the cost savings,as LEDs normally have a long life.
regds
MEL
I may not win often, but I damn well never lose!!! ;)

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