Last edited by Tim W; 09-03-2011 at 08:20 PM.
Bored at work today, thought I'd do an experiment. I grabbed our little handheld laser thermometer gun, whatever they are called, and thought I'd do some temperature readings on my Haiku on high. Here are my results..
I started the test with the light at 23*C, the temp it was just out of my pocket. The room's ambient temp was 22*C. I took the reading on the beveled edge of the head just below the fins, which seems to be the hottest part to me. I ran it for 10 minutes and took a reading once a minute.
0m - 23C
1m - 24C
2m - 25C
3m - 26C
4m - 26C
5m - 27C
6m - 27C
7m - 28C
8m - 28C
9m - 28C
10m - 28C
If I took a reading on the fins, it was usually about 1 degree warmer than the beveled part of the head. After shutdown, I tried to get a read on the emitter itself, but I am not sure if it was reading that properly. I was getting a value of about 30C, which seems pretty low, so maybe the reflector was goofing with the laser or something.
Just some fun data I thought you all would enjoy. I'm no expert on such things, but I guess what I take from it is that the thermal management of this light is pretty good. It seems that the design and allows for sufficient heat dissapation, and once warmed up, it's able to maintain a pretty stable temperature, well within the happy operating range of the LED.
Don, e-mail sent
Don, I am responded too
That is surprisingly cool Nick. I was expecting something like 30+ to 40 degree celsius. Now I wonder what the XM-L ones would show.
My XML seems to be as hot or should I say as cool as my High CRI Haiku at high.
It must be in his pocket for quite sometime.
As you know, I use my lights when I bring my children for our evening walks,
and not once did the XML feel too hot to touch.
Last edited by jiuong; 10-10-2011 at 04:40 AM.
"Live as if you were to die tomorrow, learn as if you were to live forever"
Since I sold all of my McGizmos in early 2009 I didnīt follow the technical aspects of Donīs lighs anymore but rather admired their appearance.
Well, I just bought a Haiku XP-G here on custom b/s/t. I thought I read the Haiku engine has a 3-4.2V voltage range but unfortunatelly canīt find that information anymore to verify it before I put a rechargeable into the light.
Is it 3-4.2V or 3V or even 3-6V?
Thanks in advance for helping out
Don, On the 3S LE, I noted that I will start to loose my 3 stage access when the primary is 2.95V on an XML. With the same battery, I still have normal access to all 3 levels with an XRE and XPG setup. Something to do with the VF of the LED?
Don & BenChiew, thanks a lot for your quick response
Noted that there are various LE versions. Thanks.
Anyone know what LED an XPG-L is in a Haiku? I've never seen reference to this designation before and have been told it exists. Anyone...?
Does not really fit the CREE naming convention