Flourescent -vs- LED: Todays reminder, 'White' LED lights do not emit pure white.

Compared to white emitting fluorescent bulbs, todays white light emitting diode technology still has color wavelength limitations that causes White LEDs to emit much more blue light.

http://en.wikipedia.org/wiki/Image:LEDFlashlight.jpg

If you have an LED display, expect a blue hue if your RGB output has not been adjusted (- blue) to compensate.

I'll stick with fluorescent in the mean time.

 

See, I always thought I was just imagining it when I thought my LED flashlight was emitting a blueish shade of light rather than white. Now I know I'm not insane...

I'm still confused what the benefit of LED over flourescent is supposed to be, though.

 

it's probably on purpose, to the human eye blue is brighter than white, all bright white paints contain blueing agents.

 

More even lighting, brighter, less power usage which also leads to less heat.

 

Typical white LEDs use a blue diode covered with phosphor to generate white light, their spectrum is limited with only two peaks, at blue and yellow and they aren't ideal for photographic work.

There are RGB LEDs using the mixture of three primary light colors to form white light, they have much higher color gamut but are more expensive to produce compared to white ones.

Some manufacturers have recently announced notebooks with RGBLED backlit screens but what panel technology they use is still something remains to be seen.


Different LED backlit technologies.
http://en.wikipedia.org/wiki/Led#White_light_LEDs


Typical white versus RGB LED spectrum:


Typical color gamut of different backlight technologies:

 

wikipedia............ what a reliable resource lol

 

There is nothing wrong with Wikipedia in general. There many references to reliable sources in most of their articles and you can always double check the information.

And thanks for your contribution.

 

bwhahahaha.... i just get annoyed when people use wikipedia in university as a reference and they become surprise when they loose marks for it lol

and my contribution: from a general perspective... the idea of "true" white light = purity. Therefore in most cases getting purity is extremely costly. For example in gold or diamond.. So i guess the best colour to be closest too would be from the blue spectrum (instead of the red / green)

 

Well, if that happens too often there, then maybe you haven't chosen the best university...

Otherwise, standard white LED backlit screens are fine for most people, even TN CCFL ones are, but there aren't great for photographic work which would make some people look elsewhere.

In the end, it's always good to have a choice, then it depends on your needs.

 

LoL (on the university remark)

ya I'm perfectly fine with my two 24 inch TN Panel monitors =) I do notice the colour difference.. but the price and the size is just too awesome to give up!

 

Ah ****! I didn't realize this was a University. My mistake...

I agree that Wikipedia is plenty reliable as a source of references. As for getting annoyed at people who use Wikipedia as a reference... why? At least it eases the curve a bit ;-)

 

so if a White LED consists a Red, Green, and Blue LED. The Blue can be easily compensated for by increasing the output oof the other two or vice versa. Assuming this is not done, the blue hue you "expect" to see, will only be visible if you compare it to a fluorescent light side by side.

 

lol the last part of my sentence is the key point.. they become surprise when they loose marks for it lol they whine about how they lost marks.. and the prof / TA are suddenly idiots and hard marker?

and about you didn't realize this was a university.. = = my post wasn't even serious it was a joke!!! "wikipedia............ what a reliable resource lol"

plus... the fact that anyone can change it... ya...

 

Um... and I joked in return? Thus the last statement...

;-)

 

ya ya it's all jokes until someone gets hurt lol

side note =O you ordered a u330.. Congratz =)

 

No, it cannot. Single element white LED can only have its overall brightness controlled via PWM. The -blue adjustment is applied to the LCD shutters. On the other hand, RGB LED is three discrete LED's of which brightness can be individually controlled.

For example, Dell offers white LED and RGB LED along with 2CCFL and 1CCFL display options on the Precision M1440 workstation. See brochure under Wide Aspect Display.

 

Those RGB LED displays must be expensive as fook.