BLF Interest list for Very High Current Beryllium Copper springs Pt1(ENDED)

Perhaps. It’s better to do these kinds of mistakes once, and never do them again.

BTW, I did a build recently with a dual spring array on a Q8, and the results were very nice :slight_smile:

My lumen numbers on the Q8 with the normal lens were 5230 lumens.

My numbers on the Q8 with the Kaidomain AR lens were 5649 lumens at 30 seconds, with brass screws.

My numbers on the Q8 with the replaced springs and AR lens are now at 6764 lumens at 30 seconds, with brass screws.

These tests were all done with 4x Samsung 30Qs at 4,19V.

Next, bypass the PCB traces, to gain even more (I don’t know how much, but Dale always does).

Got my springs today. I think there was more tape than envelope.

Nice. Looks like a bunch of US people got their springs exactly today.

I still have not got the pm with payment details, in meantime some of you got your springs. Should I be worried?

He might have overlooked you. I just paid a couple days ago.

Same here, I haven´t received any PM as well.

Me too. Didn’t receive PM.

From 10/6/18

Don’t worry. I’ve started PMing again.

You 3 next are on NY list for PMing, along with 2+3 other people.

My springs showed up as well and look great. I hope to put together an MT09R with them this week if I can find the time. I just started some new work, so not sure when that time will be available.

Paypal sent

My springs came today. Thanks!

The taped envelope was intact. The springs look good. I haven’t had a chance to do anything with them, yet.

For my most practical and frequently used lights, I plan to replace many of my spring bypasses with these springs, either singly, or nested. For my highest output hotrods, I’ll probably continue using spring bypasses.

Out of curiosity….what would be resistance decrease with a third, larger spring?

It would be cut again in half.

The resistance I calculated conservatively of the big spring is 10mOhm.

A dual spring array would be capable of 5mOhm, and a triple spring array would decrease even further down to about 2,5mOhm.

However, the problem would be compatibility and stiffness of the triple array, and for me?

Lots of math again :slight_smile:

Thanks for the answer. :slight_smile:

I got my MT09R built yesterday when my internet was down.

Overall the new springs are working quite well and are way easier to work with then the bypasses if you have a hot air gun.

Using these springs vs the bypassed spring carrier on the same light showed around a 10% difference in output on average.

The main spring for the driver has to carry the full ~40A of current so it sees a bit more of a drop when that spring is not bypassed but still quite good. For production lights these style springs should work great, 90% of the performance and way way more reliable. I don’t see me doing a lot of bypasses from now on, that extra few percent is just not worth it in most cases IMHO.

The spring tension is also great, although in the MT09R they are taller then the stock springs so getting the tailcap on is a little harder but not a big deal.

Very happy with my order and already thinking I should of ordered twice as many.

They shrink a bit after the first few full compressions so even though they may look big once you realize that it may not be as big of difference as it seems.

Yeah. The small ones do more plastic deformation than the large ones since their wire gauge/diameter ratio is higher, meaning they are stiffer, and require more force to compress to the same height, meaning a higher potential for plastic deformation.

The large ones have no problem with deformation though. I produced them at 13mm since I knew it was going to deform at first compression, and testing them revealed I was right to go from 12mm to 13mm, as the spring lost about 1,0mm.

They did not lose any more height after that, even after 20 full compressions.

TLDR: Big spring is better than small spring in terms of mechanical strength.

Regardless, like hank@ Emisar mentioned in a thread about his the deformation happens once and then it’s pretty well set. It’s fine since both springs were designed knowing it would happen.