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When you slice the dome close it falls almost exactly on BBL or slightly under. With a lot of current it doesn’t shift much either. Only problem is output takes a decent hit and some flat LEDs are harder to focus

Thanks for hint. Is the LH351 dome hard? Heating up then slicing works good for this one?

My way is without heating: I have a series of 4 washers that fit between the led and the solder pads of the ledwires. They go from thick to thin, with the thinnests one the correct height to slice just above the phosfor. I use an oldschool two-sided Wilkinson razorblade to slice layers off the dome. I learned how to keep the blade straight while cutting and that for the last slice the angle that the blade makes makes a difference. Also the thickness of the solder layer is a factor involved in where the final cut ends, I try to seat the led as flat on the board as possible to get the same height all the time. Try practising on a wasted led.

Sounds like it will be added to my kit :slight_smile:

Very precious hints. Appreciate a lot :beer:

I do the same as djozz only with 2 or 3 washers. If you try it with just one the edge of the dome will likely tear off at the end of the cut. As djozz mentioned the solder height is a factor if you want a close cut but probably even more important is to try to use the same type of MCPCB each time. I have a 20mm one I use that has never had solder on the LED +/- pads so the washer sits flat/the same way every time.

Actually it’s good to know others experience similar problems, I was even thinking of getting something thinner than Wilkinson razor, but the trick with double / triple washer is definitely worth trying. Many thanks.

I’m not sure everyone understood what djozz was saying. I think he’s saying he uses a thick washer to slice first, then a slightly thinner one to slice a bit more, then a thinner one again, then the thinnest one gets the last slice to be the right height.

Neven,

Do you know whats the tint bin of your 3000K Luxeon V2’s? On the datasheet there is 5A, 5B, 5C, 5D, 3U, 3L in 2700K, 3000K, 3500K.

I don't know exact tint bin, but I've never seen Lumileds LEDs available in narrow tint bin range,they are only available as 3 or 5-step MacAdam ellipse.

Thank you

Thanks for pointing it, now it’s crystal clear.

:+1: I think that language to describe technical procedures is the most challenging type, perhaps even for native speakers.

I see clearance sale in some copper mcpcb DTP, ther will be replaced or what is the reason?

They will be replaced by new design,fully gold plated this time, so price will be a little bit higher (similar to 3030 DTPs). Existing PCBs at reduced price will be available until stock is exhausted.

Hi Neven,

Will you also be making a 5050 16mm DTP MCPCB?

I don't plan to have 5050 pcbs anymore, only two popular LEDs use them these days: SST-40 and XHP50.2, and I don't stock any of those, so it doesn't make too much sense to have pcbs and no LEDs.

Luxeon V is IHMO better LED overall than SST-40 so I don't want to stock two very similar LEDs, XHP50.2 has ugly beam tint - don't want to stock those either for this reason.

It makes sense… Thanks

LD-B4-20 ETA?

Someone gets it! Only passable excuse IMO for sst40 is dedomed.