Ima4wheelr asked for beamshots of my new modded SR51 so here they are vs a couple other popular throwers.
The lights:
(all beam shots posted with lights in this order L->R)
C8-dome intact XP-G2 S2 2B 12 chip 105c, 4A at the tail on high
ZY-T08-dedomed XM-L2 U2 1D direct drive 5.5A at the emitter, 144kcd
SR51- dedomed Noctigon mounted XM-L2, resistor mod and springs braided, 4.87A at the emitter. 133kcd (in the thread I had stated 122 but it turns out there IS still a slight difference between "low" and high after the resistor mod and I had measured that first time on "low")
first set of pic's is a 100m shot to a three story brick wall
control
C8
ZY-T08
SR51
this next set is two sets of shots, one zoomed in one zoomed out
control
zoomed in c8
zoomed out C8
zoomed in Small Sun
zoomed out Small Sum
zoomed in SR51
zoomed out SR51
and just for fun
warm white quark QP2L-X burst mode
Neutral white XP-G2 custom driver Li-ion fenix E12
Very nice shots man. Really like the area you used for the second set. Really gives a lot of info on the beam and is cool looking. I see you had a helper (3rd from last frame).
Thanks bro. Wish I could take night shots like that.
EDIT: Digging the dedomed SR51. Smooth even with a dedomed emitter. That says a lot for that reflector.
The T08 either had 25R’s or 15M’s (high drain samsungs like 25R’s but only 1500mAh, pulled from powertool packs), the SR51 had NCRB’s and the C8 had a 15M.
This is the shadow TC300 measured on my external shunt resistor harbor freight DMM
Nah its a nice area, it just happens to be invisible from the road behind a middle school, notice none of the graffiti is gang symbols, just names and art. I actually think its pretty, one of my favorite places, I literally go there every night. Also notice the lack of trash, not even any cigarette butts or beer cans. I love it there, its artsy not trashy, if it wasn’t all tagged up it would be a boring concrete run-off area.
Plus notice the 3 large dogs? I’ve never felt even the slightest bit of concern, my wife and kids come here by themselves, granted they don’t go in the tunnel without me and atleast the white dog Mota but that’s more cause of the danger of going into a large underground ~1km long tunnel.
I really like it's smooth beam pattern with the dome as mid-range light. I would think a tighter hot spot restricts to just being a thrower, but your beam looks like it still has plenty of spill and a smooth transition to the hot spot. When you factor in amps, it appears that your SR51 beats the T08.
I love it, I’ve actually listed this ZY-T08 for sale since getting it, the form factor was exactly what I was after (side switch/big head tho 3s cells would make it perfect but they dont quite fit). The hot spot isnt quite as small as the smallsun but like you I think the beam is much more useful than the T08 and I dont feel like its lost much useful spill beam at all from the dedome like you usually expect. My only complaint is the odd shape/size non direct MCPCB but an XM20 has plenty of room, its just a challenge to get the stock hold-down’s to work.
I’m swapping the driver for a custom UI BLF17DD (and converting the carrier to series), when I do that I’ll be swapping in a U2 1D as well, the tint is the one thing I like better about the smallsun.
Thanks. I’m using my freshly calibrated (about 3 weeks ago) ExTech LT300, scored it NIB from a pawnshop on the internet for such a good price I sent it directly to extech for certification.
The tunnel is actually the only way I was able to notice a difference from “low” and high on the SR51. It shows the beam profile in a way flat wall shots cant, very useful especially for throwers.
How exactly did you get it to go from 3.4A to 4.7A?
“The final report-
Stock was 3.4A to the emitter for 58kcd
Modded & dedomed it’s running 4.7A for 123kcd (see post 14) and a much more pleasing tint. ”
…
Wasn’t it just a metal bar for the sense resistor?
Talked about in your thread Here.
Yes it was “just a metal bar” but that bar IS the resistor, it does provide resistance albeit very low. Removing the bar and replacing it with a piece of solid copper wire is all that was done to increase the current, well I also changed the 20AWG wires to 18AWG but that was cause I needed a longer wire to read the emitter current,I’m sure the stock 20AWG could handle 4.8A no problem.
I would hold off on doing it just yet, I have a new SOIC8 FET inbound (also have one for Ima4wheelr coming too) and will be returning the resistor back to stock and swapping the FET out trying to achieve the same (or higher) drive current while still retaining low.
Honestly I wouldn’t recommend it, you loose low (its still there but such a small difference its hard to tell them apart) and yout taxing the stock FET, I believe a FET swap will accomplish the same thing but be a much better way to go about it.
And yea your right about it being slippery, not sure why its so bad there, maybe cause the concrete isn’t textured like a sidewalk is but its ridiculous, I’ve managed to not fall yet but the dogs can’t keep their legs under them lol.
Hey Ck.. Good thread posted by unknown. I'm not sure about the staring point though.
I would do this first and then follow the thread.:
Go to "My Account"
Click on the "Edit" tab
Towards the bottom, select "Advanced Post Editor" for "Preferred input format for Forum topic::
After you do that, when you work on a thread, you will now see 3 rows of edit icons. Don't use the first row. That row has the "Simple Post Editor" icon set, which is what you are likely currently using.
When you click on the "Insert/Edit Image" icon (in the second row of icons), you can then follow the instructions in the thread linked by unknown.
I’ve finally finished up my SR51 rebuild, I got my oshpark battery carrier parallel conversion plates a few days ago and rebuilt the carrier into 2P then swapped out the stock driver for a BLF 17DD driver with a 3-mode (with 120sec turbo step-down) version of Werner’s UI.
I dont have build pic’s, didnt stop to take them and its late and storming here, I’ll take new beamshots within the next week or so. I did do some measurements, the light runs at 6.4A to the emitter and does 156kCd.
