Nitecore nu53 runtime

[blindedbythenight]

Hi all

Anyone have or have knowledge of the Nightcore Nu53?

It runs at a claimed 1300 lumens for 9hrs with no apparent stepdown..... Which I'm struggling to believe.

 

[DaveTheDude]

Runds on what, atomic batteries? Permit me to doubt...

 

[Hooked on Fenix]

Runtime chart on their website in the user manual shows a drop from 1300 lumens to about 500 lumens in about a half an hour, then staying mostly flat until just before hour 9. Then it drops after that. They aren't claiming there are no step downs at the 1300 lumen setting for 9 hours. That's ANSI specs. Runtime to 10% original brightness after tested 30 seconds in (to prevent overinflated starting numbers once the light heats up). That would be runtime until output drops from 1300 lumens to 130 lumens.

Headlights can't take that much heat. They are not held letting your hand transfer some heat away from the light like a flashlight can. Depending on the design, this often limits regulated output to between 300-800 lumens with 500-600 being pretty good for 21700 lights. Temperature regulation kicks in on good lights to prevent the light from blowing your head off after it overheats like a pipe bomb. This is a good thing.

 

[sirpetr]

Runtime chart on their website in the user manual shows a drop from 1300 lumens to about 500 lumens in about a half an hour, then staying mostly flat until just before hour 9. Then it drops after that.

Headlights can't take that much heat. They are not held letting your hand transfer some heat away from the light like a flashlight can. Depending on the design, this often limits regulated output to between 300-800 lumens with 500-600 being pretty good for 21700 lights. Temperature regulation kicks in on good lights to prevent the light from blowing your head off after it overheats like a pipe bomb. This is a good thing.

Some headlamps can, its all about highest LED and electronics efficiencies (=lower heating), proper aluminium heatsink design and lights must have no thermal resistances. 800-1000lm is then doable in this kind of design even without any movement in a room temperature. But, yes, hanhelds generally have greater surface and will keep your hands warm.

 

[Monocrom]

No step-down??

Oh, that's hilarious. This belongs in the "there are some Jokes" topic over at the CPF Cafe sub-forum.

 

[desert.snake]

No step-down??

Oh, that's hilarious. This belongs in the "there are some Jokes" topic over at the CPF Cafe sub-forum.

Yeah, I didn't believe it either until I looked at this

Lucifer headlamps | Ultra powerful headlamp X, 5000lm

One of the worlds most powerful headlamps. Amazing light output of 5000 lumens. Best headlamp for orienteering, mushing, racing and downhill

luciferlights.net

6 diodes, if the same power goes to each, then at 1000 lm each should have 167 lm. My HDS at level 23 is barely warm (~200 lm i guess), and here there are large ribs and a lot of metal. But it is hardly possible to do without lowering and without overheating on smaller headlights

I remembered that Betty R from Lupine can also be attributed here. It has 5000 lm and also 6 white diodes. At 1000 lm there are no brightness drops due to overheating

 

[sirpetr]

Yeah, but I wrote its possible in this kind of design (all in front). We do have 850lm Z2Mini and its not really easy to overheat it standing still in the room temperature. When there would be 2 LEDs efficiency could be even higher and 1000lm doable. The thing is there is more material getting warm.

For instance our 1900lm M6+ can run on 950 lumens and our ULTRA 8000lm headlamp (has got large cooling fins) can run on 1800lm brightness without any thermal drop. Maybe would be interesting to test also 2700lm mode. Thats at the edge what is possible today. XM-L2 or similar LEDs wont do that, every percent of efficiency counts here.