Maxtoch? Ive always read it as Maxtorch…
Plasma sounds better than a shard of cotton wool. 
Flashlight porn :heart_eyes: I’ve got a bare XHP70 on the way and have the sinkpad… Never reflowed a LED before and don’t want to screw this one up, gotta practice on some old XM-Ls. Any tips for a first timer? Can I do it with a hot air gun and solder paste?
Heres one of Old Lumens earlier videos on reflowing.
Theres lots of others but cant seem to find them at the moment. What you suggest is what I use.
Yeah, Ive seen that one… but at the very end he says it would probably be better with a hot air station, which is what I have. I guess I’ll do some trial and error with old XM-Ls I’ve ripped out of other lights.
I can still recommend for reflowing all sorts of stuff building a heatblock like I did by rebuilding a 12V 40W solder iron, post 27 of this thread:
That’s cool… or actually not, it’s hot. Did you fabricate that alu block yourself or did you get it ready like that? And thanks for the video, but I gotta confess: I didn’t run the volume down, I turned it up :bigsmile:
If you’re at all concerned about coming somewhat close to the manufacturer reflow profile I suggest using a hot-air gun and clamping the mcpcb to a sizeable cpu heatsink.
Then just blow the hot air through the heatsink fins underneath until things start to melt.
Use a thermometer to monitor the temps if you want but it will allow you to more gradually heat up the equipment to the melting point. Then also more gradually cool it down to avoid any thermal shocks. Just my method that I’m comfortable with.
Edit: …or build Djozz’s lamborghini of reflow heaters that thing is great! 
do this light use a FCN13895_SEANNA-A reflector?
That light is a 4” bezel, the Seanna is 6”. That light is a triple, the Seanna is a dual optic system with a TIR inside that focuses light to a Fresnel on the outside. Very impressive and very large set-up.
How do I know? I got one in the mail today! HUGE!
Not sure if this has been mentioned yet, but Cutter Electronics has TOP BIN XHP 50 and 70 in stock with NO purchase limit.
They didn’t have top bins a few days ago and I’ve yet to see anyone with other than the 2 primary bins, 6500K in the 70 and 3000K in the 50.
And a minimum $11 shipping to the US.
are there any PCB and optic made specifically for xhp50, xhp70?
To me, hot air reflow is the best. I put the mcpcb in my small vice. I use the hot air to warm the mcpcb a little, just enough for the solder paste to spread easily and then I add the paste. Put the led on and heat from underneath with the hot air. A few seconds later and everything flows and it's done. Much easier than the solder iron and the nicest thing is that I can just take the hot air off from under it and it can cool right there in the open air. Less time to heat up and less time to cool down.
Supposedly, I am getting XHP70 N2 3A, but it's sort of confusing. Maybe 5, maybe 10, maybe nothing. It's very difficult to get answers from overseas.
Unless I am reading the data sheet wrong ( its always possible) the N4 bin is top for the XHP 70 which is what cutter has here on a star in 2 shades ( both cool)
http://www.cutter.com.au/products.php?cat=Cree+XHP70
And the 50s in J4 which is a bin higher than even listed on the data sheet in 2B
http://www.cutter.com.au/products.php?cat=Cree+XHP50
Am I reading something wrong?
You’re reading it right, the N4 is the highest bin for the 70. I had some parts on order from Cutter while they were out on Holiday the first of the year. I’d spoken with them about getting stock in on the 70’s and 50’s and was expecting to be notified as to when they expected stock to arrive such that an order could be combined. They have informed me that the parts I had on order shipped and had not received any of these emitters up to that point. So they must have gotten these in over the last week.
Nice that they’re the top bins and in good tints as well. Would have picked up a few if they’d let me know as requested. 
Nice find VB, now how do we get around the high shipping cost from Australia?
That’s why I don’t ever buy from Cutter. It’s an outrageous sum of money to have them shipped, so I settle for whatever RMM, IS, or China has.
Maybe Steve can help us out, stuff his pockets full before he comes over here on vacation? 
Is there a good 6V driver available to push this to 6A? Haven’t looked into that for a while…