Thanks millions, BlueSwordM !!
I have a CW 70.2 MT09R and am having TA work his magic with. The Cool White is waaay too blue for me, and now I know the right spec for it's replacements.
The 80CRI is key. I'm a high CRI kinda cat after all. Higher than 70s, anyhow. I really notice the color rendering subtleties.
Cheers !!
Ocelot can you measure the Lux/Lumen of yours ?
I think it’s just a buck driver, so max output will decrease with depleting cells.
The driver is FULLY regulated, the output will NOT decrease with depleting cells
Why? Because instead of having a 2S battery pack then bucking that voltage to an XHP70.2 6V forward voltage, it has a 4S battery pack.
Doing this allows for a very large voltage delta with the buck converter meaning with a 6V LED, output will FULLY regulated until the cells are empty, even on turbo if cooled well.
That is only valid for the XHP70.2 version.
At higher output levels, the XHP35HI version will suffer from decreasing brightness.
I’m pretty sure Nicolicous was talking about the 35 version with 12V emitter. In order to have constant max output you need a buck/boost driver, which I don’t think it has.
My MT107S XHP35 HI NW Upgrade version has the 4S1P battery configuration. Will it still suffer decreasing brightness
?
You can check out the runtime graph of the BLF GT, also with 4S1P batteries and XHP35: Review: Lumintop BLF GT
That XHP35 HI was evaluated with the driver for a GT.
Is the driver for the GT the same driver Haikelite MT07S HI Upgrade version is produced with ?
It’s not the same, but it is (most likely) of the same type, i.e. a buck driver.
Maybe vs maybe not, is vs most likely, is confusing me and others here.
I will Email Haikelite and try to get an answer. I do appreciate you bringing that to our attention because this is one of the reasons I purchased this light to begin with,” for longer run times “. I had assumed because of the 4S1P it would have sufficient power to keep up with the XHP35 HI, but now I am not sure.
As BlueSwordM wrote, the 4S1P has sufficient voltage overhead to power a 6V emitter like the XHP70.2 (6V) full power without stepping down until batteries are almost dead (step down due to heat disregarded). The 4S1P does not have sufficient voltage overhead to do that with a 12V XHP35 emitter, as can be seen in the runtime graph of the BLF GT.
In order to have constant max output in the 4S1P XHP35 configuration you need a buck/boost driver. The reason I wrote that it’s most likely not the case is simply because I don’t see this in reviews. With lights using 4S1P XHP 35 or 2S2P XHP70 (6V), I’ve always seen reduced output with depleting cells, meaning a buck driver is used.
So there is no certainty, but statistically it seems most likely that the MT07S HI uses a buck driver and not a buck/boost driver. But of course you never know.
You can test this easily if you have a lux meter. Do a ceiling bounce with full cells, then a ceiling bounce with cells at let’s say 3.7V and 3.2V for example.
You are correct, I had forgot the XHP35 HI is a 12v led. I was thinking it was 6v.
Thank you for clearing that up ” hIKARInoob ” , I was confused again as usual. 
Cheers man! And don’t worry, I’m confused all the time. 
I do have another Question while we are on the subject, if you don’t mind me asking.
If a light comes with a 2S2P and 4 batteries for a XHP35 HI led, can you add 4 more batteries 2S4P ? Keeping the total voltage the same while increasing capacity without damaging the driver ?
Yes you can.
But you would have to make a longer battery tube.
If you do make a battery tube, perhaps you could sell it in a group buy.
An example is the Manker MK35 (2S2P XHP35). With 2S4P voltage remains the same, so the driver sees no difference besides a bit less voltage sag with 8 cells. But this occurs within the working voltage range, so no problem here.
Sweet :+1:
You guys are Great. I will make the battery tubes for two other lights ( MT07 and MT35 PLUS ) that need this. But the MT07S will stay because I need it smaller for every day carry use. I do Appreciate your enlightenment, I’m still learning…
Oh that would be dope.
Perhaps you could sell it?
Would be amazing.
Guys It has been more than a week since I reported my "missing metal belt/claw" issue to BG on 04/06. Since the last email from them on 05/06, asking me to wait, two further emails sent to them over the last few days are being met with silence. I also sent a message to the BG rep here a couple of days ago, but he/she hasn't responded to my message either.
Can I please ask those of you who ordered this flashlight on this GB to indicate which flashlight you bought, and if you received the "metal belt claw" (see photo below) in your package. It will help those of us who did not receive one when taking this up with BG. Thanks!
