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Old 09-24-2015, 01:47 PM #1
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Default Modifigng the Gearbest Skyray 4000lm

I just posted my review of this flashlight here, and I also wanted to show how I modified it.

So I started by taking the aluminum reflector out to find this:





So to augment the heatsinking I took a heatsink from a Phat light-54 and cut the fins off, drilled holes and cut off the corners. I then heatsinked it to the back of the LED's









Initial run time (until heatsink reached 115 degrees Fahrenheit):
20s on High
45s on medium


Final run time:
90s on High
240s on Medium

And now I can actually use this light without it overheating the LED's


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Noteworthy Lasers and λ's:
685nm: 24mW pointer pen
660nm: 230mW LPC-826
647.1nm: Omnichrome 643 Ar/Kr ion 5-line max (high hours)
638nm: 600mW Kryton Groove
635nm: 5.8mW DIY pointer pen 0.6mrad
632.8nm: 20mW HeNe SP-107 - 6mW Hughes 3225H-C made in 1980.
594.1nm: 4.1mW Coherent HeNe from Sigurthr - 1.7mW HeNe REO-LHYR-0050M
568.2nm: Ar/Kr
543.5nm: 3.1mW Coherent HeNe
537nm / 542nm / 545nm / 550nm multi-line DPSS +/- 1nm
532nm: 500mw CNI PGL-III-C
515nm: 36mW laserBtB
514.5nm/501.7nm/496.5nm /488.0nm/476.5nm/457.9nm 2214-40MLA Argon Ion
462nm: 2W M462 Kryton Groove
450nm: 94mW laserBtB
445nm: 2.5W NDB7875 Kryton Groove - 40mW Pen laser using NDB7242E diode
405nm: 100mW PHR-805T

Building: 337.1nm: TEA laser

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Old 09-26-2015, 03:05 AM #2
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Red face Re: Modifigng the Gearbest Skyray 4000lm

I think its a lost cause on this light, initially I thought the walls thick enough to build an aluminum slug that contacts the body but by the looks of it is way too thin

Heatsinks work because air is flowing around them. Still air is a terrible conductor, any thermos will tell you. Installing a block there will help delay the inevitable, but it won't be able to dissipate it. It just hoards heat until the temperature is identical with that of the LED slug, which the additional thermal mass then delays the LED slug cooling. This might actually do more harm than good, but kudos to you in keeping that optimistism lit

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Old 10-19-2015, 01:09 PM #3
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Default Re: Modifigng the Gearbest Skyray 4000lm

Expanding on that point, would it be possible to perforate the body with some small holes to allow air movement? I know compromising the integrity of a somewhat watertight electronics enclosure (read: Host) is not a great idea, but if air needs to move it needs to move. I'm asking for my benefit as well as I wonder how a still air problem like this could be approached. Thanks!
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Old 10-21-2015, 01:58 AM #4
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Default Re: Modifigng the Gearbest Skyray 4000lm

nice!!
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