[Alibaba Adventure] GT-FC40: XHP35 HI's Bigger Sister, with 90+ CRI

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rngwn
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I did some very crude brightness measurement by shining the hotspot on a luxmeter at 1ft distance.

The measurement reads ~120k-140k lux on the highest mode (with the H2-C)

That equals to 11k-13kcd or 210-220m of throw distance in a C8s body

I’m now searching for the proper 20mm driver for these, but it’s really hard to find.

SKV89
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11k-13kcd in a C8 head seems very low.

rngwn
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That could be two things:

  • The nail polish coating isn’t perfect and there might be some low-key shorting which prevents the driver from pushing 1.5A, or prevents the driver from entering the turbo mode. Which I will figure out the way to measure the tail-cap current draw.
  • I might have overloaded the luxmeter and it stops scaling properly past 100k lux (which is it’s stated maximum range, although it continues to register the brightness over 100k lux anyway). I might try to test again from further distance and see what happens.
Skylight
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The hotspot shows much less tint shift than with the XHP70. I’m looking forward to this led in 4000K. Maybe I will use one in a Haikelite SC26.

rngwn
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Update: Light measurement at ~2.5ft (75cm). It seems like my suspicion about the Luxmeter overloading is correct.

XHP70.2 version:

Brightness @2.5ft: 34.5k – 35.5k Lux
Intensity Estimated Output: 20.0k – 20.6kcd
Estimated Throw: 283-287m

FC-40 version:

Brightness @2.5ft: 29.5k – 31.5k Lux
Intensity Estimated Output: 17.1k – 18.0kcd
Estimated Throw: 262-268m

By this setup, it seems like FC-40 produces about 10-15% less output than XHP70.2 (but there is quite a hefty cost moving up CRI from 90, of course)

Agro
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75 cm is likely still too close. The main reason is that the beam is not fully collimated at short distances. I’m not sure what is the minimum good distance for C8 but if you can measure at 5m I think that should be enough.
Also, what you measure is not output but intensity. I’m nearly sure that at the same intensity XHP70.2 has much higher output.

rngwn
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I finally bought extra pair of 18650s and can now do side-by-side beamshots. Here you go.

 

 

Looks like FC-40 produces a lot throwier light than XHP70 in a C8s body.

DB Custom
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Correct Agro, a minimum 5M throw distance should be observed for Standards.

On lights I’ve built with a mile or more throw capability I use 50M for testing. If you have the light focused for optimum distance, the V shape of the beam profile hasn’t come together at closer distances and the meter isn’t getting the concentrated light to show the true throw reading. After getting lights that throw a mile or more, I can’t think of a couple of hundred meters as being throw, gonna take 3/4 of a mile or more to consider it “throwy”. Wink

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I received the two samples yesterday, but need a few days for the test because life is quite in the way this week, no spare evenings in my cave behind the cupboard at least until the weekend.

rngwn
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Ah well, beat me to it. At least you can see the direct tint comparison today.

I will leave the long distance measurement to Djozz then.

Two weeks sure is a long time to wait in this instance. Oh well, nevermind, there he is.

KevinZA1988
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I need this LED!

Acebeam L18, Armytek Prime C1 Pro, Armytek Prime C2 Pro, Armytek Tiara C1 Pro, Astrolux MF01 Mini, BLF Q8, BLF A6, BLF FW1A, BLF FW3A, BLF FW3C, BLF LT1, Convoy L6, Convoy C8+ , Convoy S3, Emisar D4, Fireflies E07, Jaxman E2L, Manta Ray C8.2 long version, Olight S1R Baton II special edition series, S2R Baton II, Olight Baton 3, Olight Warrior Mini, Olight M2R Pro Warrior.

Most of them have been modded! =)

https://photos.app.goo.gl/JaJaDv4V838AEJf39

Tally-ho
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@rngwn, could we have a picture of the GT-FC40’s footprint, please, to know if it is the same as the XHP70’s footprint (in order to swap emitter of a 12V XHP70 flashlight with larger MCPCB) ?

rngwn
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Tally-ho wrote:
@rngwn, could we have a picture of the GT-FC40’s footprint, please, to know if it is the same as the XHP70’s footprint (in order to swap emitter of a 12V XHP70 flashlight with larger MCPCB) ?

I cannot see the underside of the emitter for now. I might ask the manufacturer for that, but the chances are pretty slim.

djozz
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I tested the two samples, test post here:

http://budgetlightforum.com/node/68899

KevinZA1988
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Pleasessign me up for 2x of each, if possible…

Acebeam L18, Armytek Prime C1 Pro, Armytek Prime C2 Pro, Armytek Tiara C1 Pro, Astrolux MF01 Mini, BLF Q8, BLF A6, BLF FW1A, BLF FW3A, BLF FW3C, BLF LT1, Convoy L6, Convoy C8+ , Convoy S3, Emisar D4, Fireflies E07, Jaxman E2L, Manta Ray C8.2 long version, Olight S1R Baton II special edition series, S2R Baton II, Olight Baton 3, Olight Warrior Mini, Olight M2R Pro Warrior.

Most of them have been modded! =)

https://photos.app.goo.gl/JaJaDv4V838AEJf39

rngwn
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KevinZA1988 wrote:
Pleasessign me up for 2x of each, if possible…

Please update your quantities in the GB thread.

RamBull
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Any updates on the GT-FC40? Acebeam is planning to use the A4 bin in 4500k in their E70 and if the tint is similar to your images will hopefully be just as beautiful.

Pyrokiwi
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There are multiple beamshots and reviews round of the convoy models which have been released for a while now using them.

I really like my 4000-4500k, but would recommend you have a look round some more formal / experienced reviews/reviewers.

RamBull
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Pyrokiwi wrote:
There are multiple beamshots and reviews round of the convoy models which have been released for a while now using them.

I really like my 4000-4500k, but would recommend you have a look round some more formal / experienced reviews/reviewers.

Thanks, for the heads up. I like this post the best and it seemed like you guys knew what you guys were talking about. I will search the forum. Toodaloo. Hat

mattlward
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Well, someone else woke this thread up… so I am going to comment on it as well.

I now have 2 lights with the 4500k version of this led. The tint and CRI just blow me away! I will be converting several XHP70 lights to use this LED over time. Right now all I have are a stock S11 and M21b, both have become favorites for night walking lights with the small reflectors they just light up everything in front of you with a wonderful rosy light.

EDC rotation:
FW1A, LH351D 4000k (second favorite)
FW3A, LH351D 3500k
FW3A, SST20 FD2 4000k
FW3A, Nichia 4000k sw40 r9080 (favorite light!)
FW3A, Cree XP-L Hi 5A3
Emisar D4V2, SST20 4000k

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