But, taking a lumens reading immediately after taking a lux reading on the same light, same cells, IS maintaining constants. And those number disagree with the representation of physics here.
I can’t argue with physics, unless the chapter and verse being quoted are wrong.
By the way, who said we couldn’t send a man to the moon? And who is now planning to send men to Mars? Physics and it’s laws change as we learn, there are very few hard cold facts.
I’m not trying to convince anyone of anything. I’m the guy with the light in hand, the results from testing in front of me. It’s everyone else that’s scrambling trying to figure it all out. Fact is, at 42% of the output, the light is making less than 7% of the throw.
That does not support the theory that halving lumens also halves candela. So when the facts from testing don’t support the theory, it’s time to put new chalk on the board.
The meter read 1830 on High, 28100 on Turbo. My meter has 3 places, it actually showed 183 to the power of 10 in High, errored in Turbo and I had to switch to the power of 100, where it showed 281.
I argue to understand, not necessarily to prove anyone wrong. I forget a lot. Widely known fact. So if I can argue myself to an understandable truth it is well worth all the verbage expended in the acquirement.
Yes, it is entirely possible that I made a mistake taking the readings, so I will do it again. (I have been known to make the same mistake over and over, so bear with me. ) I will go slower, double checking mode levels along the way, for extra care and authenticity.
So there ya go, y’all are pretty much spot on. Within a couple percent. lol
I forget little things, like all of how the UI works. I forgot that when you press and hold from off the TN42 comes on in moon, then will cycle through 3 more levels LMH. BUT if you cycle it through again, there are only the 3 levels LMH, moon is only accessible from off. So I must have cycled it back through checking that I had the right mode after setting up the meter and was actually in Medium instead of High.
The numbers, carefully obtained…
High (Level 3 in the main UI) is making 1003.95 lumens (I got that correct in the light box) and 272Kcd for 1043.07M throw
Turbo (Double click in any mode when on) is making 2477.1 lumens and 702.5Kcd for 1676.31M throw.
Thank ya’ll for pushing me into finding where I went wrong. 41% of the lumens is making 39% of the lux, so it’s fairly linear if not quite exactly. The actual throw numbers are not linear, the candela reading pretty much is.
Why is it that by the numbers, with the lumens at 41% and the lux at 39, the throw is actually at 62?
I’m gonna have to give up. When the time comes that you know you don’t know half of what you think you know but you really only know a quarter of what you thought you knew you know then it’s time to have a drink. Seriously though, you hear about the football players that retire dang near a vegetable after so many concussions in their career? Or a boxer? Well, I’ve had more concussions and micro concussions in the past 16 years than a great many professional athlete and it’s catching up to me. Gonna be drooling and staring off into space before long, I can see it coming. (I’ll have a light to shine the way though, in case anything’s really out there.)
Thanks for clearing that up that measurement, Dale.
You know, I find that I don’t really understand a concept until I’ve been utterly confused about it a few different times; it’s all part of the process.
(listening to some tunes on new dual driver headphones from XiaoMi, GearBest. $17, these things sounds like Bose or something!)
Well, almost 17 years ago I started having issues with severe spasms, eventually diagnosed as a Conversion Disorder. Stress, both physical and emotional, causes me to have spasms that might just affect my arms, or my whole body, sometimes causing my head to shake side to side violently. It’s these last episodes that crash me, sometimes leaving me walking crooked for several days. Early years, it was daily or every other day. Nowaday’s it’s more sporadic but damage has been done and each time causes more. I once had a pec muscle torn for 2 years! And once I went to shake a bottle of ketchup at the table and it caused a partial vision loss for several minutes in my left eye.
I mod for relaxation, got into it because I needed a portable light to use to take macro ring shots at weddings. Couldn’t find a light that fit the bill and started trying to create one. Found that I liked the modding part of it and before you know it I’ve got more flashlights than most stores. lol
Gettting harder to wrap my mind around things, to remember details, names, virtually anything really. Sometimes what I DO remember may be way off base, leaving me arguing a false point but convicted in the knowledge I’m right. Hard to believe, I know, but it’s true. And then I see that little detail I was missing, and the rest comes together and shows me I was on the wrong page. Whatareyagonnado? And such is life in the basement of Dr. Frankendale, discombobulated and non-incorporated.
A boost driver can be very well-designed and the efficiency can be optimized, but due to the nature of the circuitry the efficiency of a boost driver can never beat the efficiency of a buck driver, given everything else being constant except that for a buck driver has Vin > Vout.
Although running 4 batteries in series isn’t something that sound very safe, but it can sustain at the maximum output much longer and better than the TN42 (and let’s not talking about any programmed step-down feature). Correct me if I am wrong.
P.S. I am always a fans of buck driver with Vin > Vout, because instead of having a 400kcd output that can only sustain for 5 mins then quickly decrease over the time, I’d rather have that 400kcd light which can constantly sustain at this output until the batteries are almost depleted.
I think the LedRise calculator is fine, because it takes the “Viewangle” into account, which determines how floody or focused your beam is.
Thanks for the clarification and all the hard works and measurements that put into this Dale. Your works and other’s theoretical input have linked theory and field results together pretty well, and that’s feeling good.
I wish someone out there would mod this with a dedomed xpl,xpg2, or xml2.
A year ago, we would be so stoked to have a reflecter of this caliber with a xml2 or xplHI.
And we would either dedome it or drop in a dedomed xpg2.
These were the known emitters for massive throw.
I feel the xhp35hi is geared for lots of throw with great lumens.
A super amped up xpl or xml2 wouldn’t be that much less lumens, but I suppose the lux would be a lot more don’t you guys think?
My vote would be dedomed xpl . Better throw and only a small (400?) lumen loss.
Because it has better throw than xpl hi . Ofcourse xp-g2 would throw better , but it will have around 1k lumens only .
Spotlights have this kind of reflectors all the time. But are regarded as dumb. But TN put a slightly bigger reflector and all run like hell. And charge 200$. Next year they will bring 10mm larger reflector and same story. Meanwhile years before spotlights are offering the same for 30$, but in a plastic body. I dont think the body costs 170$ pardon me.
I charged up my “20 Million Candlepower” 12 inch wide spotlight that uses an automotive headlight bulb. Was going to take it with me for comparison beamshots on the mile long throw shots. Got it charged up, took it outside, it’s so pathetic I left it at home. I even have a high grade upgrade bulb in it. The Thrunite TN42 slaughters it.
The big spotlight was like $40, all plastic, bare bones with no heat sinking. Big 12V sealed acid battery. It’s not designed with any sort of quality in mind, just stick a car headlight in a plastic housing and give it a base that allows it to be propped up at an angle, gearheads’ll buy it at the Auto shop because they work on their cars at night and/or go fishing.
The cost, yeah, I have to agree I think the cost is high. AceBeam, Thrunite, Nitecore, Fenix, they all have the same type pricing. I don’t like it myself, have few of their lights. This one though, this one was introductory with a 20% discount and promised that mile… I couldn’t help it. The only mile long thrower I ever built was based on an Olight SR-90 Intimidator, a $400 light before I even started modding. At $179, it seemed like such a deal… and compared to what’s out there on the market, it is!
One thing I found was tripping me up on the ideas of distance and light is that in photography we are trying to maintain brightness for the proper exposure. With flashlights we are allowing brightness to fall to a 1/4 lux. Massive difference and one I was not taking into consideration. In photography, we’re also trying to maintain a shutter speed that allows for some movement, so the light has to be considerably brighter to provide the shot.
Incadescent or HID does not matter, lumen output does. I don’t think you have seen what 100W incadescent philips in a 20cm reflector can do. Don’t even venture into HID land, where 200W HIDs live for 100$+battery. Those millions of candles are EASILY attainable. And the “top” led thrower has 700k and people are talking like god is walking among us.
The point is, they want to milk money. All they do is put few mm bigger reflector and claim the “top” performer. Look at the Courui01 mods with 82mm reflector. Think of what an xpg3 sliced 150mm wide and 150mm deep reflector can do to this poor TN.
) I will go slower, double checking mode levels along the way, for extra care and authenticity.
