I was actually referring to Canonās new Rebel SL1. Itās a mini DSLR that would use the lenses you already have and step up the image quality youāre used to with your 400D. No built in lens, youād use the ones you already have or the kit lens.
The primary thing for taking beamshots is a Manual mode. For taking shots of kids you need a fast lens, be careful of built in zooms as they tend to slow down horribly when zooming and your shutter gets too slow for action.
The Canon G15 might also serve you well, it has a fast lens and does well in low lightā¦also takes macroās and is considerably cheaper than a G1X.
And now back to the regularly scheduled programā¦.I saw a pretty significant tint shift in my XM-L2 T6 when I de-domed it, but the XM-L U2 didnāt drop so much, wonder why that is? The XM-L was pretty blue to begin with and itās now just barely on the blue side of white, I really like it. The XM-L2 T6 was a NW to begin with and got considerably warmer, almost to the point that I want to correct it with Lee film but I donāt want to lose the output. How can I go about bringing the orange/yellow T6 back up towards white? Or is that possible?
I actually cut a cube of copper about 3/16ā thick to stack the emitter on top of the copper star, reflowed them onto the star together then soldered the leads from underneath. I had to inset the pill deeper into the reflector as well, but now the problematic reflector is no longer close to the solder points and the de-domed XM-L2 sits up inside the reflector for a nice tight beam with a fairly decent spill. I can see a white barn lit up at 610 yards, but what the lux is way over there I have no idea. Looks bright enough over there to read a note by, but I canāt be for sure. Would be interesting to see what cd this light now has.
Iām thinking that the reason for what you saw is that it depends on the phosphor maybe, the thickness, etc. of the phosphor layer?
On the āAccidental MTG2 dedomingā thread (Accidental MTG2 dedoming.), two people (myself included) noted that when the MT-G2 was dedomed, for us, the color/tint went cooler, rather than warmer, and we were both surprised.
As with the 2nd generation of Cree LEDs, not sure about the others, but XML2 and XPG2 seems to be really yellow after dedoming, even if it was CW 1A to begin with. Using the block to elevate the emitter was clever. Unfortunately there is no accurate way of determining candela by eye since your iris contracts and expands to let in less and more light respectively.
Click on the pic and open it up in Flickr, then right click on it to see it original size. That barn is 610 yds away! The camera settings were chosen to represent what I was seeing, I was comparing 2 lights. The fence in the foreground is 100 yds from the light. The trees that appear in front of the barn are actually 320 yds from the camera while the barn is 610 yds.
Settings: 0.3 seconds Ę/2.8 ISO 1600 15.1 mm (35mm equivalent to 28mm) G1X
Well, thereās not much I havenāt done! lol Being new this has all been a learning curve. It now has an E1320 driver with 5 modes, memory, no blinkies and is running 3.82A at the tail. Youāve seen the star and emitter. I also bypassed the springs with 20ga wire. Is there something else I can do? Other than the Acrylic UCL AR coated lens that it already has? Iāve hounded MRsDNF to make a copper pill for me but no luck so far. Vesture of blood may do some for these lights, keepin my fingers crossed.
I might could add a couple more 7135s, just got my M3 head up to 4.22A, de-domed, with an E1320 driver that I added 2 chips to.
I have a 1/4ā thick piece of copper that Iām thinking of cutting a round for a heat sink, since I canāt do threads I can do a different approach. Why couldnāt I use my dremel tool and cut the shelf of aluminum out of the pill, press fit this thick piece of copper in itās place? I could reflow the star/emitter onto the copper first so itād be like one piece, then press it into the sleeve of the pill and thread it back into the light.
Think thatād work? Then I could add like 3 more chips and get it up to 5A or so? This is an XM-L2 weāre talking about, so it should handle it.
Kinda like this? This one has a 1/4ā ring of copper for the driver to set in, which I wouldnāt need here as Iāll have the aluminum pill with the threads left.
Replacing part of the aluminum pill with copper is definitely a good idea, the less aluminum it has to travel through to get to the body the better. OldLumens melts copper shot into gaps to make sure thereās maximum contact surface area, you could do that too.
And if you do that you could bring your XML2 to 6A comfortably. I recall someone here has a TN31 modded that gives 6.5A to a dedomed XML2.
I didnāt and still donāt have any way to measure the lumens, so I donāt know if there was that small loss or not.
I went to check itās amperage again cause I wasnāt sure I was remembering correctly and it isnāt working properly. Seems thereās a ground short on the front side of the board. Itās happened once before but itās not easily remedied this time, so yeah, for sure, itās coming back apart. Iām getting to know this light REAL good! lol
So I will be doing the copper heat-sink, modifying the pill and revising how the board is mountedā¦which will also allow me to add chips.
Ooops, missed all this last night... Yes, a light meter helps big time.
Dale - that emitter stacked on copper looks sooo cool because that's always an issue of trying to get the emitter in the reflector and battling with the height of the wire connections interfering with the reflector seating. For the HD2010, you'll probably hit a point of diminishing return for the Vf demand of the XM-L2 with a linear driver and a good cell (KK, IMR, etc.). I don't think you could get 5 amps out of that setup, maybe 4.5 amps, maybe, but don't think you can get even that. Every 7135 you add steals more voltage too. The latest HD2010 build I did with a de-domed XM-L2 got 200 kcd with a Nanjg at 4.2A. The more copper you have in the pill the better, but you will probably not see any improvement in light output - the biggest, most important upgrade for light output increase is the copper star itself witha direct thermal transfer.
This is the light meter I have, and where I bought it: ebay 200-000-LUX-New-Digital-Illuminance-Light-Meter-LX1330B. This is a pretty common model that rdrfronty and manxbuggy1 have been using, though they more recently bought a better, more expensive meter (~ $130) but I believe the readings compare well with this one.
Iāll definately take those tips in mind, have to do some rebuilding on it as there is an issue somewhere so Iāll look into it and might add a chip to get up in the 4A range.
Iāll post when I get into it, and try to remember to take some pics!
Ohh - ExTech is the better brand of light meters (that rdrfronty and manxbuggy1 bought one). Here's a nice model: http://www.coleparmer.com/Product/Extech_Precision_Light_Meter_LT300/EW-50510-93, and for only $160 more you can get it fully calibrated (NIST traceable). Funny because here at work, we make/sell nuclear medical equipment and we use NIST traceable radiation sources to calibrate and test our equipment...
Heād say āWell, Rosanne Rosana Dana, itās alaways a sumtin!ā
I got the copper in the pill, took some doing but itās now got a half inch thick copper pill, cut out on the backside for the driver to fit into. Added 2 chips to the 11 that were already there and got it all put together. My fancy star/emitter shorted out. So I took that apart, made very small pillarās of copper solid wire to solder in to bridge the gap from emitter to copper star. That worked out beautimously! Tiny stuff that.
Got it all put back together and was only showing 3.42A at the tail, added a spring bypass at the driver and fried the tail switch. My very first toasted tailswitch. So Iām modding the tailcap with a McClicky that I just happened to have on hand for just such an occasion. Hope to get this all wrapped up before dark-thirty and get some results back from all this work today! lol
Not sure if this has been said yet, but gun cleaner popped the dome off my XML in about 30 minutes. Iām going to give it another hour or so before I test. Iāll post my findings afterwards.
EDIT: Also, by test I meant see if it still works. I have no way to test lumen output. I can say though the tint didnāt seem to change much if at all for me.