What is angry blue?

[ebow86]

Ok, I give up searching. Why do they call it angry blue? Where does that originate from? My surefire A2 and 6P LED have the angry blue tint, A2 very much so, but I don't understand, what's angry about it?

 

[PeaceOfMind]

I don't think there's much meaning to it, other than just being a colourful way to describe a tint. Sort of hyperbole for a tint that is disliked I suppose. I doubt you could get people to even agree on what qualifies as angry blue.

 

[tolkaze]

an LED can be blue, as a lot of cool white LED's are, especially Nichia GS and the like. They can be blue or purple, but I think "angry blue" is a different phenomena. I guess it can be divided into two groups

1.) What I understand, it is when you overdrive an LED or it runs too hot, the angry part seems to be how harsh the blue is, and how much damage you are potentially doing to the LED.

2.) Bad tint bin, just unpleasant to look at and can make even expensive lights look cheap and nasty.


Not sure, but think that touches on it.

 

[jhc37013]

I'm not sure of the origins of the term but when you say it people who have seen angry blue before can identify with it. How else would you describe a truly blue tint? I'm not sure either besides just saying "really blue", if you have seen enough tints then you can probably easily visualize what cool-white is but if you have ever seen angry blue even just once you won't forget it. I hate angry blue but thankfully I have only witnessed it mostly with the little coin battery keychain light's.

I would say though I would not describe my P60L's as angry blue though, more like cool-white.

 

[StarHalo]

"I'm angry I paid this much for blue.."

 

[jhc37013]

"I'm angry I paid this much for blue.."

LOL, well case solved my guess is that is the real meaning of the term.

 

[FlashKat]

Your description on #1 is the correct answer. When a LED is over driven it turns into a deep blue, then the LED starts to die until there is very little output.

an LED can be blue, as a lot of cool white LED's are, especially Nichia GS and the like. They can be blue or purple, but I think "angry blue" is a different phenomena. I guess it can be divided into two groups

1.) What I understand, it is when you overdrive an LED or it runs too hot, the angry part seems to be how harsh the blue is, and how much damage you are potentially doing to the LED.

2.) Bad tint bin, just unpleasant to look at and can make even expensive lights look cheap and nasty.


Not sure, but think that touches on it.

 

[Flying Turtle]

Just a guess, but I'll bet Craig at the LED Museum was the first around here to use "angry blue". His descriptions are classic.

Geoff

 

[Dude Dudeson]

My M60 is angry blue to some people.

My Quarks are sickly green to some people.

I'm glad I'm not those people.

 

[Pöbel]

As mentionend before, angry blue does not refer to a natural tint which is very bluish durin normal use.

Instead its the tint CHANGING to blue when the LED is overdriven or overheating indicating that its dying.

 

[ti-force]

Like previously mentioned by a couple of people in this thread,"angry blue" is a common term (on CPF anyway :grin2:) for thermal runaway. This basically means that the emitter is over heating, and if it's not shut down within a matter of seconds, the emitter will go from angry blue to :poof:, complete darkness. The emitter will tint shift to extremely blue when this is happening, and the longer you keep powering the emitter, the bluer the tint shift. The :poof: part created the "angry" part, and the extreme tint shift to blue created the "blue" part.

Thermal runaway can happen if an emitter isn't heatsinked properly or if it's extremely overdriven, or a combination of the two. If the emitter is being directly driven off of the battery with no current limiting, it's a vicious cycle once thermal runaway starts. The emitter starts to overheat, the voltage forward lowers, current delivered to the emitter increases, the emitters gets even hotter, voltage forward drops even further, current increases more etc., etc. until :poof:. This happened to me with an SST-90 emitter so you might say I learned the hard way :candle:. The tint started shifting to "angry blue", and at the time I didn't know to watch out for that, but in less than 8 to 10 seconds I had an emitter that was no longer in working order. For about three days, I was doing this - :sick:....:sick2:........:green:......:fail:.......:mecry:........:drunk:.........:mecry::mecry:.......:fail:.........:mecry:......:mecry:. Fortunately I was able to pull out of my deep depression, and then I ordered a replacement SST-90. When you fall you've got to get back up, right? :thumbsup:

So if you ever see an emitter start to shift to an extremely blue tint, it would be in your (and the emitters) best interest if you backed out of the throttle and shut it down immediately, if not sooner :D. Maybe this will give a better understanding of the term "angry blue".

 

[carrot]

ti-force nailed it.

 

[kramer5150]

The common CPF use for the term is any emitter that has a "lot" of blue in its color spectrum... enough to significantly hinder its color resolution.

Anyone know when and who was the first to use this term?

 

[jamesmtl514]

the user fires up his/her flashlight expecting to see a nice white, instead is greeted by blue, user gets angry... voila

 

[ti-force]

Anyone know when and who was the first to use this term?

The first time I saw the "angry blue" term used, it was used by BigC to describe almost frying an emitter in light he was testing. I've never seen it used to describe an emitter that just happens to have a 6000k + tint under normal operating conditions.

 

[saabluster]

Like previously mentioned by a couple of people in this thread,"angry blue" is a common term (on CPF anyway :grin2:) for thermal runaway. This basically means that the emitter is over heating, and if it's not shut down within a matter of seconds, the emitter will go from angry blue to :poof:, complete darkness. The emitter will tint shift to extremely blue when this is happening, and the longer you keep powering the emitter, the bluer the tint shift. The :poof: part created the "angry" part, and the extreme tint shift to blue created the "blue" part.

Thermal runaway can happen if an emitter isn't heatsinked properly or if it's extremely overdriven, or a combination of the two. If the emitter is being directly driven off of the battery with no current limiting, it's a vicious cycle once thermal runaway starts. The emitter starts to overheat, the voltage forward lowers, current delivered to the emitter increases, the emitters gets even hotter, voltage forward drops even further, current increases more etc., etc. until :poof:. This happened to me with an SST-90 emitter so you might say I learned the hard way :candle:. The tint started shifting to "angry blue", and at the time I didn't know to watch out for that, but in less than 8 to 10 seconds I had an emitter that was no longer in working order. For about three days, I was doing this - :sick:....:sick2:........:green:......:fail:.......:mecry:........:drunk:.........:mecry::mecry:.......:fail:.........:mecry:......:mecry:. Fortunately I was able to pull out of my deep depression, and then I ordered a replacement SST-90. When you fall you've got to get back up, right? :thumbsup:

So if you ever see an emitter start to shift to an extremely blue tint, it would be in your (and the emitters) best interest if you backed out of the throttle and shut it down immediately, if not sooner :D. Maybe this will give a better understanding of the term "angry blue".

We have a winner! I am just going on memory here but I believe the term first gained usage because of the SSC P4. It was/is infamous for turning "angry blue" fairly easily under any real overdrive. The Lumileds and Crees although capable of producing this effect took much more abuse to illicit this behavior.

 

[WadeF]

I had a Terralux Maglite dropin that would overheat the SSC LED and go angry blue, and I took pictures!

Before it got angry:


ANGRY:

 

[ti-force]

I am just going on memory here but I believe the term first gained usage because of the SSC P4.

Thanks for the sharing your memory of why the "angry blue" term came to life; I didn't know that :thumbsup:. I mean, I knew it didn't originate with BigC, but I wasn't sure how it originated.

I had a Terralux Maglite dropin that would overheat the SSC LED and go angry blue, and I took pictures!

Before it got angry:


ANGRY:

Thanks for sharing :D. That's exactly what everyone needed to see. So everyone take notes; if you see a tint shift to blue like in the pictures above, it would be in your best interest to disconnect power, or else :poof:.....:D.

 

[recDNA]

My M60 is angry blue to some people.

My Quarks are sickly green to some people.

I'm glad I'm not those people.

I like "angry" blue or purple unless it toasts the LED. I hate green, beige, or yellow. I like white best though.

 

[Jash]

I've got angry blue, **** yellow, vomit green and even pure white. I don't care really, they all make light which is it the point. The brighter the better.