KD (kaidomain): Deals and new products thread

Buy / Sell BudgetLightForum Deal Alerts
288

Hi friend

Yeah. I will post only the Triple PCB to kaidomain.com asap.

Thanks

Ban

289

:+1:

290

Please consider about sourcing a Neutral XHP50 with 80+/90+ CRI :slight_smile:

291

WTF?

Am I the first one to notice this?: Cree XM-L2 T3 7A3 Warm White 3000K - 3250K CRI90 LED Emitter

Also mounted on these boards:

Cheers ^:)

292

I posted it at the S Mini thread some days ago .

Very nice :slight_smile:

293

It went directly in my cart I noticed it too :wink:

294

yeah i saw it too, it’s on my wishlist, but not sure if Cree is capable of red reproduction in any of their white emitters at all t.b.h…

295

My order doesn’t show up at the site.
No order number, nothing…
??

296

could you add the Cree XHP35 HI E4-3C to your LEDs?

https://www.cutter.com.au/proddetail.php?prod=cut3023

297

Interesting. A few hours ago I've been having a good time with a friend, talking, etc. He has funded me to upgrade his inexpensive headlamp, a SingFire L-05 1*Cree XM-L2 T6 3-Mode 850LM Cool White LED Headlamp. Sooo, I'm waiting for him to fiddle with it and discover what MCPCB the thing is fitted with. Gonna try one of those 90+CRI XM-L2 emitters. He mostly uses the headlamp for close-up work (sort of an amateur mechanic), so the boost in colour rendering ability and the lesser impact on his night vision should be really worth it. Doesn't it?

Cheers ^:)

298

If I remember correctly, its MCPCB is 20mm.

299

Just made KD order the other day and missed that. Too much already in the cart and I dumped some 4500K XP-L HI out to get it to a reasonable price. Definitely would have adjusted “other” items to get some of the triple nichias for that price. Hope they last long enough to get some for the next order.

300

Thanks antiparanoico, I'll wait for him to tell me something tomorrow, I have shown him both a 20mm star and a 16mm round MCPCB in order for him to know what to look for under the reflector.

Just don't wanna pull the trigger too soon (LoL).

Cheers ^:)

301

I use a headlamp very often, when i hobby on lights for example.
It and my reading glasses make an awesome support team.
But i recently put a Nichia 219C 4000K in it and i’m really happy with it.
it’s driven by an nanjg AK47 in 3 modes 1050mA, which is more than enough, i use it mainly in medium mode.
I gave it flood optics too.
I wouldn’t want it to be a warmer tint.
This springtime daylight tint is nice and ‘awake’.

302

…and i’m waiting for KD to reply, my order still doesn’t show up so i sent a message with details…

303

What's the PWM frequency on AK-47s? 4.5KHz?

I've recently had some discussion with regards to battery life and light output efficiency for Nanjg 105c drivers, and now I see them with completely different eyes. I mean, what's the typical PWM frequency for these drivers? Because AMC7135 regulators do need some time to turn on/off, and this actually makes a hell of a difference in energetic efficiency at “high” (6+KHz) PWM frequencies. Source: AMC7135 PWM LED control – works? @ Pratik Panda

Dropping out of regulation at up to 3.9-4V for PWM modes (Qlite version)? What the @#$%!

Sooo, those 4.5KHz of its sibling AK-47 seem better with this respect.

Cheers ^:)

304

I’m not sure, but it sounds like around 4kHz.
(ever noticed it’s mainly the switch that sings along with the PWM frequency?)
It’s high enough to be invisible. (at least to my eyes)

305

Mmm, just read some documentation about this. There's some sort of switching transistor inside those AMC7135's, that is the switch you mean, I guess.

“… high enough” for you, of course. Everyone's sensitivity is/may be different. However, “PWM” here means that, in essence, light output isn't “continuous”, but a sequence of PWM wave periods.

Honestly, PWM is suited for strobe and SOS, which are periodic signals. However, “emulating” a continuous “stream” of light through a periodic PWM on/off wave is, or can be, extraordinarily gross. The lower the PWM frequency (flicker) and magnitude (efficiency), the grosser. 1% PWM moonlight mode? :facepalm: LoL! The amount of drawbacks I can see on this now, in practice (efficiency, flicker, etc), is quite substantial.

I'll be back.

Cheers ^:)

306

There's variations with the 7135's but we typically program them at over 8 kHz. Actually with 13A's, we use 9.4 kHz phase-correct PWM or 18.75 kHz fast-PWM.

Biscotti, STAR firmware, etc., pretty much all use these PWM settings.

307

You mean 9.375KHz phase-correct/18.75KHz fast PWM, Tom E?

AMC7135 PWM LED control – works? @ Pratik Panda

The aforementioned above link has errors on the period scale. Actual turn-on/turn-off times: 80Îźs/40Îźs.

Of course, 9.375/18.75KHz PWM frequency is outrageously fast (and wrong!) to drive AMC7135s. However, if you are to question my reasoning, have another cup of evidence:

HKJ's Test/Review of Qlite Rev.A 7135*8 Multiple Modes Circuit Board 3.04A

A little briefing of HKJ's quotes:

“The driver does not disable pwm at high.”

“Due to the fast pwm, the driver does not turn fully on. This makes the driver drop out of regulation at a fairly high voltage.”

“Due to the high pwm frequency, the curve it not square, but rounded.”

“In low mode the light is never in regulation.”


Fellows, the irregular shape and level of the regulator's output during the turn-on phase tells me its efficiency barely reaches 40% for that 8Îźs (turn-on) period.

With all of this in mind, it is clear to me that:

AMC7135's switching frequency is slow, so if PWMing them this has to be taken into account: slower PWM frequency (much slower!). I wouldn't go above 2-3KHz to minimize the impact on energetic efficiency.

0K. Time for a brief retreat.

Cheers ^:)

Originally posted on Thu, 12/08/2016 - 05:35; edited for fixups.