Lumapower MRV SE

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fishinfool
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Don wrote:

26 hours. Still going at much the same level

72 lux / 16 lumens

And this is with a freshly charged 18650 with the MRV on low right? 

Very impressive!

 

Don wrote:

"But as I said long ago, you are more likely to be killed by a dead fish dropped by a seagull in the Sahara Desert than by a lithium ion

Don
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I've not run an instrumented temperature measurement, but I can. I keep a fan or two pointed at any light running on high or medium but once the cell finally gives out - 26.5 hours and it is still at 3.69V on low I'll do a temperature test. Problem is that Windows chokes on trying to run more than one meter at once. I'll dig out the Linux laptop which can handle more than one meter at a time and log temperature against output once I've got the software working properly. This will not be before next weekend as I have two machines to build and set up immediately. I hate building and setting up Windows boxes!

 

And given that I have had to work at the job that pays my mortgage every day for the last 49, I don't get a lot of free time to do the stuff I want to do.

 

The numbers from my light tests are always to be found here.

https://spreadsheets.google.com/ccc?key=0ApkFM37n_QnRdDU5MDNzOURjYllmZHI...

Don
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fishinfool wrote:

Don wrote:

26 hours. Still going at much the same level

72 lux / 16 lumens

And this is with a freshly charged 18650 with the MRV on low right? 

Very impressive!

 

Yup! I am impressed!

I've not done the current measurements yet but i am surprised by how long it has kept running. Having taken a break to measure the voltage, it still has quite a few hours in it. I will probably stop the test when i get up in the morning as otherwise I'm likely to kill the cell

 

The numbers from my light tests are always to be found here.

https://spreadsheets.google.com/ccc?key=0ApkFM37n_QnRdDU5MDNzOURjYllmZHI...

fishinfool
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Man, we really lucked out when we bought these MRV's at that really low price right?  They're also my favorite P60 lights which I use but mostly play with all the time. 

Gotta love 'em!  Smile

Don wrote:

"But as I said long ago, you are more likely to be killed by a dead fish dropped by a seagull in the Sahara Desert than by a lithium ion

Don
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For about the same price as a DX 18650, you can't beat the value. Even at 4x the price (or what they are selling them for nowadays) they are still good value

 

The numbers from my light tests are always to be found here.

https://spreadsheets.google.com/ccc?key=0ApkFM37n_QnRdDU5MDNzOURjYllmZHI...

Don
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It finally stopped. Down to 10 lux / 2 lumens. Cell voltage just on the borders of acceptable at 2.8V.

 

The numbers from my light tests are always to be found here.

https://spreadsheets.google.com/ccc?key=0ApkFM37n_QnRdDU5MDNzOURjYllmZHI...

fishinfool
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Don wrote:

It finally stopped. Down to 10 lux / 2 lumens. Cell voltage just on the borders of acceptable at 2.8V.

 

That's simply amazing!  Thanks Don!

Don wrote:

"But as I said long ago, you are more likely to be killed by a dead fish dropped by a seagull in the Sahara Desert than by a lithium ion

anduril
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Tell me - how come it's suddenly possible to build a great, long-running, extremely bright, cheap, Q5 (!) light?

Is it some magic LED? State-of-the-art driver?

If not, and it's just a great LED/driver combo, then what keeps us (or rather manufacturers) back from putting it in 16340 keychains, Solarforce Skylines or whatever?

 

Are there any under-$80 lights that can compete with this one?

Don
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anduril wrote:

Tell me - how come it's suddenly possible to build a great, long-running, extremely bright, cheap, Q5 (!) light?

Is it some magic LED? State-of-the-art driver?

If not, and it's just a great LED/driver combo, then what keeps us (or rather manufacturers) back from putting it in 16340 keychains, Solarforce Skylines or whatever?

 

Are there any under-$80 lights that can compete with this one?

 

No!

All of design is a compromise.  You get to choose which bits matter. Look at the lumens on low. Most of the time a Fenix E01 can beat it.

Compromises

Choices.

And remember that the MRV is a bargain at $20.

 

The numbers from my light tests are always to be found here.

https://spreadsheets.google.com/ccc?key=0ApkFM37n_QnRdDU5MDNzOURjYllmZHI...

anduril
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Sure, usually it's choices...

But in this case - how many medium-sized lights can you think of, that are generally equal or better than this one?

Excluding secondary bits like lumens on low (not because of usefulness, but because setting different mode levels costs the manufacturer nothing).

 

Let's say I'll take one, rip the driver and led from it and put it in a 14500-type body.

Won't it be also one of the best AA-size light available?

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