Yeah, the FET for a buck driver plays by very different rules compared to the normal FET drivers we build around here. Switching losses make up as much or more then the resistance losses in this case.
Basically for the stock buck setup (which I prefer since it offers at least some level of regulation) 6-8A is about the best we can hope for with this driver. Although that is still well over 8000 lumens and enough to max out the xhp70.2 before massive diminishing returns.
Texas Ace – Do you have any outdoor beamshots with XHP 70.2 on turbo?
I thought for sure he had those beamshots on this thread, but I think he only posted them in the main GT thread. Here is that post.
Texas_Ace wrote:
Ok, so another update on the XHP70.2 mod for the GT prototype V2. I got some beamshots and got to see it at longer range last night.
After defocusing it some more with a 4.5mm tall centering ring the dark spot in the beam is virtually gone at ranges less then a few hundred feet.
At longer ranges you can see a very slight darkening in the center if you look close on a flat surface. Much like a stock L6 beam, still more then acceptable IMO.
The overall tint and beam are great, the tint shift is very minor and the best I have seen with the latest gen 2 Cree LED’s thus far with SMO reflector.
So here is a rundown of how the light sits right now:
BLF GT
XHP70 12V mcpcb (prototype)
XHP70.2 80CRI 4000k LED
R040 2512 resistor for 6A turbo and 4.8A ramp (max recommended is R047 for 5A turbo as it will be less stressful on the driver, that said I have had no issues with 6A but I only use turbo for short bursts).
4.5mm tall centering ring
If everything keeps testing out good and interest is shown I would like to talk Lumintop into releasing a kit with all the above parts to make this an easy swap.
Here are the results with the above parts:
Throw at the top of the ramp, figure slightly higher if you had a full 5A there:
~380kcd
~1230m of throw
~6000+ lumens (will know more when I test the LED separately)
With the 6A turbo mode the numbers are:
~432kcd
~1300m of throw
~7000 lumens
The stock 2.5mm appears to give the best throw while 4-4.5mm appears to give the best combo of throw and removing the dark spot. If you were ok with a bit of a dark spot the throw numbers would be a little higher.
Some very kind individuals donated some cash to allow me to keep pursuing this project. So I plan to print off a few more centering rings to try and fine tune it but doubt it will make a big difference.
I will also be ordering some more of these 80CRI LED’s to test on the sphere and with a sliced dome. I might also try another LED if I can find a better bin with another tint.
I am also talking to DEL about options to increase the drivers power handling abilities. I would like to up the power to around 8A as that is about the max before it starts really dropping off in efficiency.
So still some more testing to do. I should be placing the order for the LED’s and other components in a week or 2, I want to combine it with another order I need to make with the driver components but first we have to figure out what those components will be.
Overall impressions of this XHP70.2 version is it is a fantastic light, much better at closer ranges then the xhp35 due to the larger hot spot and extra lumens. The xhp35 throws a lot further that is for sure. There is a place for both lights, they don’t really replace each other.
Now what you really want, some not so great beamshots. Still dialing in the camera settings but it was so cold I kept shivering making the changes hard to do/ So I called it a night and will try again later to improve the settings.
Here is a klarus G35 I was testing at the same time for comparison, it is rated at 1000m for referance and is an XHP35 with 2000 lumens. Surprisingly good for the size except the lot CRI and CW emitter hurt the ability to REALLY see long range.
Note that the sky is brighter in this picture, the GT is actually being hurt in this comparison since it is not as exposed, it is really that much brighter. I did this beamshot first and then set the manual settings for most of the others with the GT to get a fair comparison.
Another comparison to the G35:
And a side by side compairson with the XHP70.2 GT and the G35:
—
Texas Ace Lumen Tube and JoshK Sphere calibrated with Maukka lights
Ok, thanks to the generosity of some BLF members I was able to order some more xhp70.2’s to test along with some more centering rings.
First here is the output test of an xhp70.2 M4 4000K 80CRI emitter.
And compared to the P2 xhp70.2:
Like a lot of high CRI Cree LED’s it does better then you would expect. The Vf is much lower which makes the lumens/Watt almost equal between the LED’s and the output is better then expected as well.
At the lower power levels it is only slightly behind and at high power levels it is only around 8% behind vs the 14% you would expect.
Now the 80CRI version does appear max out sooner, which is expected due to the thicker phosphor layer.
Overall though, it is a great LED for the GT. The lower Vf means it will run in regulation for longer then the P2 version as well and the tint is great. You can notice the higher CRI in the beam. It is worth the minor losses IMHO.
Now I would not use this LED in an FET direct drive setup, it could easily pull way too much power and go way past peak output.
Next I tried installing it in the GT.
Like before I got around 1300m of throw with the 4mm tall centering ring or around 425kcd.
I then sliced the dome and took the readings again.
With the sliced dome 80CRI xhp70.2 at 6A (forgot to take a measurement at 5A) I got around 1500m of throw or 560kcd.
Less of a gain then the P2 version got with the sliced dome for some reason but still quite good.
Like the P2 the tint did shift some, it is noticeably more yellow now, it is not for everyone that is for sure. I am debating what I will do about it myself.
I played around with the focus height as well and it really comes down to personal preference. I get the highest readings around the stock 2-2.5mm but it also has a very noticeable donut hole. Not nearly worth the ~40m of extra throw it gives.
It takes about a 3.5mm high centering ring to mostly get rid of the donut hole and 4mm gets rid of it entirely. For the very minor trade off in throw, 4mm is what I would go with. Much nicer to look at a beam without a dark spot.
It gets noticeably hotter then the xhp35 version but that is expected since it is over twice the power.
Overall impressions are that the xhp70.2 is a fantastic mod for this light if you do not need to see things a mile away. Slicing the dome is not for everyone but for those wanting more throw at the cost of a bit worse tint, it is worth it.
I sure hope that I can get Lumintop to sell an xhp70.2 mcpcb for this light after the GB is over.
hi my friend
i need to know how i can to buy like this flash light
and how much is this?
if you are realy to help me please send to my email your answer
my email : haithamkobese@gmail.com
The group buy is over…. but the info below will get you a better price than retail.
Welcome to BLF also…..
.
So now that a couple friends have seen my GT in action they both want one. Will there be any extension to the group buy after drop outs are figured? I’d like access to possibly two more at a reasonable cost if possible.
Yeah, the FET for a buck driver plays by very different rules compared to the normal FET drivers we build around here. Switching losses make up as much or more then the resistance losses in this case.
Basically for the stock buck setup (which I prefer since it offers at least some level of regulation) 6-8A is about the best we can hope for with this driver. Although that is still well over 8000 lumens and enough to max out the xhp70.2 before massive diminishing returns.
Texas Avenger Driver Series
My LED Test series - XP-L2 V5 - Nichia 219C 90+ CRI - Latticebright "XM-L" - XHP35 & PWM efficiency - XHP50 - XP-L V5 - XM-L2 U2 - XP-G3 S5 - XP-L HI V2 - Oslon Square & direct comparison to Djozz tests - Nichia 319A - Nichia 219B 9080 CRI - Nichia 219C D320 - Nichia 229AT - XHP70.2 P2 - XHP50.2 J4 - Samsung LH351D
Easy comparison tool for all my LED tests
Hi
I am searching to buy a giggle flash light does anyone know maybe where i can get one my gmail is
Serfonteinjuandre@gmail.com please message me if you help me thx
Js
Just go to this thread and ask to be put on the list for a light. They will add you.
http://budgetlightforum.com/comment/1249968#comment-1249968
Texas Ace Lumen Tube and JoshK Sphere calibrated with Maukka lights
Click this to go to signature links. I'm still around, just not reading many new threads.
I like this product
den trang tri nhap khau
Texas Ace – Do you have any outdoor beamshots with XHP 70.2 on turbo?
I thought for sure he had those beamshots on this thread, but I think he only posted them in the main GT thread. Here is that post.
Texas Ace Lumen Tube and JoshK Sphere calibrated with Maukka lights
Click this to go to signature links. I'm still around, just not reading many new threads.
Thanks Jason, I was just about to go searching for that post myself. I also thought I have copied it over here already.
Texas Avenger Driver Series
My LED Test series - XP-L2 V5 - Nichia 219C 90+ CRI - Latticebright "XM-L" - XHP35 & PWM efficiency - XHP50 - XP-L V5 - XM-L2 U2 - XP-G3 S5 - XP-L HI V2 - Oslon Square & direct comparison to Djozz tests - Nichia 319A - Nichia 219B 9080 CRI - Nichia 219C D320 - Nichia 229AT - XHP70.2 P2 - XHP50.2 J4 - Samsung LH351D
Easy comparison tool for all my LED tests
Ok, thanks to the generosity of some BLF members I was able to order some more xhp70.2’s to test along with some more centering rings.
First here is the output test of an xhp70.2 M4 4000K 80CRI emitter.
And compared to the P2 xhp70.2:
Like a lot of high CRI Cree LED’s it does better then you would expect. The Vf is much lower which makes the lumens/Watt almost equal between the LED’s and the output is better then expected as well.
At the lower power levels it is only slightly behind and at high power levels it is only around 8% behind vs the 14% you would expect.
Now the 80CRI version does appear max out sooner, which is expected due to the thicker phosphor layer.
Overall though, it is a great LED for the GT. The lower Vf means it will run in regulation for longer then the P2 version as well and the tint is great. You can notice the higher CRI in the beam. It is worth the minor losses IMHO.
Now I would not use this LED in an FET direct drive setup, it could easily pull way too much power and go way past peak output.
Next I tried installing it in the GT.
Like before I got around 1300m of throw with the 4mm tall centering ring or around 425kcd.
I then sliced the dome and took the readings again.
With the sliced dome 80CRI xhp70.2 at 6A (forgot to take a measurement at 5A) I got around 1500m of throw or 560kcd.
Less of a gain then the P2 version got with the sliced dome for some reason but still quite good.
Like the P2 the tint did shift some, it is noticeably more yellow now, it is not for everyone that is for sure. I am debating what I will do about it myself.
I played around with the focus height as well and it really comes down to personal preference. I get the highest readings around the stock 2-2.5mm but it also has a very noticeable donut hole. Not nearly worth the ~40m of extra throw it gives.
It takes about a 3.5mm high centering ring to mostly get rid of the donut hole and 4mm gets rid of it entirely. For the very minor trade off in throw, 4mm is what I would go with. Much nicer to look at a beam without a dark spot.
It gets noticeably hotter then the xhp35 version but that is expected since it is over twice the power.
Overall impressions are that the xhp70.2 is a fantastic mod for this light if you do not need to see things a mile away. Slicing the dome is not for everyone but for those wanting more throw at the cost of a bit worse tint, it is worth it.
I sure hope that I can get Lumintop to sell an xhp70.2 mcpcb for this light after the GB is over.
Texas Avenger Driver Series
My LED Test series - XP-L2 V5 - Nichia 219C 90+ CRI - Latticebright "XM-L" - XHP35 & PWM efficiency - XHP50 - XP-L V5 - XM-L2 U2 - XP-G3 S5 - XP-L HI V2 - Oslon Square & direct comparison to Djozz tests - Nichia 319A - Nichia 219B 9080 CRI - Nichia 219C D320 - Nichia 229AT - XHP70.2 P2 - XHP50.2 J4 - Samsung LH351D
Easy comparison tool for all my LED tests
Looks dangerous（too bright…）but adorable
Welcome to BLF also…..
.
http://budgetlightforum.com/comment/1318814#comment-1318814
.
You never know how a horse will pull until you hook him up to a heavy load./"Bear" Bryant
.................................. "Slow is Smooth, Smooth is Fast" ...................................
Texas Lumens Flashlights / M4D M4X Deals : sign up - save $$$$
Rudeness Level _ mΩ _ {width:70%} _ LightWiki _ LED Tint Chart
Xlamp size chart _ BatteryU _ Flashaholic? Need Professional Help??? TheOriginal _ TAB _ LightSearch _ BatterySearch _ 14500's _ DiCal
whoaaa…international dishes are offered to guests.. what is this?
Booom!
And the international dish is …. SPAM
Cheers David
Nothing to see here folks, move along...
Spam
Texas Ace Lumen Tube and JoshK Sphere calibrated with Maukka lights
Click this to go to signature links. I'm still around, just not reading many new threads.
You never know how a horse will pull until you hook him up to a heavy load./"Bear" Bryant
.................................. "Slow is Smooth, Smooth is Fast" ...................................
Texas Lumens Flashlights / M4D M4X Deals : sign up - save $$$$
Rudeness Level _ mΩ _ {width:70%} _ LightWiki _ LED Tint Chart
Xlamp size chart _ BatteryU _ Flashaholic? Need Professional Help??? TheOriginal _ TAB _ LightSearch _ BatterySearch _ 14500's _ DiCal
Just flag it as spam. Kinda defeats the purpose by requoting it…
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I did , I also replaced the link with 5xspam
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