ājust an office workerā, we all started somewhere, the first step is to realize you arenāt ājustā anythingā¦ your potential is unlimited. 
Its good but no time
Tint mixing is so hot right now :sunglasses:
SST20 3000K and 4000K both 90+CRI
Ooh nice! Iāve been thinking of doing this, but with 3 4000k nichias, and one 3000k Nichia, just to bring it down a little. Thoughts?
Yeah, nice. Do you like it X3? I really like this sst-20s. I was thinking of 2 3000k and a 4000k if the FW3A is ready someday.
Seems to me it was ToyKeeper that started the tint mixing thing with her Terminator.
I also did it years ago with a ridiculous Quad XHP-50 set up in a Lucky Sun D80. Very neat look, had to keep it reduced using 2 18350ās as with 2 18650ās itād make the light too hot to hold in mere seconds.
This bothers my OCD :laughing:
Itās nice and even though! Lol I like it
This was one mighty fine little light. Got mine today and Iāve played some with it. Only problem I see is that it ramps very quickly down from high levels since it get hot.
I also read a thread on laser forum where a guy got a 1watt laser into his eye and got permanent damage. This sounds really scary and I got to think of dangers with powerful flashlights like this and kids. Is it safe to let my kiddo use this? Sheās 4 and really liked this little light, told here to not touch the button on it and use it at the level I set for now and Iām watching all the time. Am I paranoid?
No you shouldnāt give this light to kids. My daughter is 7 and is not allowed to play with my D4 and other hot rods.
I wouldnāt leave this light with my coworkers. There worse than kids.
Its the right size for a kid but has grandpa power. Must be respected.
My nephew is 4 and is not allowed to touch my D4. His father does not let him touch his D4 either. He has his own little AA LED light that he uses and feels like itās the same as ours.
Too much potential damage to skin, eyes, furniture, etc, in my humble opinion.
I would do 2+2, I doubt that you would see a difference with only one 3000K in the herd.
I love it, SST20 have a small die so you gain some throw compared with 219C or worse, LH351D.
Iāve tested both, and the SST20 are my favorites, because of the gain in throw.
The tint mix is really nice, but I already like both tints so itās not really a surprise 
Probably not. If she is an exceptionally cautious child, then maybeā¦ but that would be pretty rare. Many adults canāt even use a D4 safely.
Start with something safer, and let her work her way up to more powerful items as she demonstrates she is responsible enough to use them.
Hmm, maybe not. I think Iām gonna try it though, mostly because I only have four Nichias to my name, 3 4000ks and a 3000k. Thereās a fourth 4000k in my buddies H03 that Iām gonna swap for a LH351D next time I see him, but that wonāt be for several weeks. I really want a nichia D4, the D4 was my first light that I got before I knew what tint I wanted, so itās a 6500k xpl-hi, no gracias lol.
Will do that Would a convoy s2 be weak enough? It needs to use rechargeable batteries and I have lots of 18650 around.
Is there more info about eye damage from powerful flashlights around here?
Some degree of trust is required, of course. People canāt even go outside without being exposed to something dangerous. I mean, some kids stare at the sun just because they can. So this is really something you have to determine on your own, based on how trustworthy your child is.
Almost any LED can cause eye damage if itās running at more than a few milliamps. Staring at a modern LED is a lot like staring at the sun. And almost any battery can start a fire if the user shorts it to itself or something. So I canāt really say any flashlight is 100% safe.
A S2+ with a 3x7135 driver (or, even better, 1x7135 driver) is a lot harder to cause damage with. However, Iād suggest going even smaller if possible. Maybe something with a single AA or AAA Eneloop battery at first.
OTOH, a parentās job isnāt to protect their child from the world, but rather, to help their child explore the world. If they make a mistake and start a fire or hurt themselves or something, itās not necessarily a bad thing, as long as the damage isnāt permanent. It may help them learn caution. Making mistakes is one of the fastest ways to learn, as long as the mistakes arenāt too big to recover from.
TL;DR: It really depends on what kind of person your child is.
Hi TK & all. Looks like Iām getting sucked in to BLF again, at least for a little bit. Thanks for posting!
A:
I apologize in advance for anything Iāve missed in the thread - Iāve only hopped around in it some, there is a lot of good content.
@TK - Something from the OP confused me:
I saw in the OP that youād improved this ~4.5mA figure in Anduril but I couldnāt find a post discussing the improvements or how they worked. I also saw your comment (āā#1570ā:TK's Emisar D4 review - #1570 by ToyKeeper ā) about how the light didnāt go into standby immediately and the next few messages between you and rizky_p explaining that the actual standby drain (as measured by rizky_p) is 24.5Ī¼A and that a project of your eliminates the delay.
I guess Iām asking for more information on the quiescent current / parasitic drain situation.
- Do you know whether currently shipping lights have a firmware with low parasitic drain?
- Was the move from 4.5mA down to 0.02mA purely a matter of firmware and/or changes in measurement strategy?
B:
Iām also interested in whatās needed (from a hardware standpoint) for a good implementation of something like Anduril, Narsil, or RampingIOS on an FET+1 driver. After reading about it I really want to order an Emisar D4 right awayā¦ but Iāve got a small handful of good momentary switch lights which need drivers and I want to rehab at least a couple of those before buying even MORE flashlights. I have an embarrassing number of non-working flashlights.
As many of you are probably aware I am VERY out of the loop. 
- Iāve read that a low-value resistor has been added to FET drivers in order to reduce ringing and keep the MCUs from rebooting at high currents.
- Iāve read that resistor dividers for momentary button flashlights should use high value resistors to minimize drain.
- What do I need in order to get started with thermal regulation?
- ā¦ what else did I miss?
Iām no expert on the matter but Iād hazard a guess: spot brightness is probably the greater enemy vs total light output. With that said, even 300lumens from a single LED can leave after images that stick around in your vision for hoursā¦ so Iād take TKās suggestions very seriously. In addition to those suggestions maybe you could consider using a diffusing film. eg site:budgetlightforum.com film - Google Search
Driving very large emitters (or multiple emitters) at low currents is also a way to reduce spot brightness. I suspect that you could (safely?) get away with a much higher output if you used a large emitter coupled with a diffusion film vs a single XP-G / Nichia 219 / etc.
A custom low-powered triple or quad might be the cheapest way to get spot brightness down while still retaining a large amount of out-the-front illumination. Or something like a C8 host with DC Fix film with an XP-L or larger-die emitter (such as an SST-series emitter). The C8 gives a large window to apply the DC Fix over.
FWIW Iām interested in this topic as well, although I havenāt really explored it. High powered flashlights are dangerous and Iām uncomfortable with the idea of children using them. Suggestions or explanations of why Iām wrong about spot brightness or how to deal with it are welcome!
Will need to read more up on it. The D4 is def bright. I read that my Maxa Beam does do damage to the eyes but from what I understood that was not because of the intensity but the fact that short arc creates a lot of UV light and not all are filtered out by the glass. The maxa is going to be locked in my weapons cabinet tho as itās def not something for a kidā¦
Iām with toykeeper on the part about parenting. This is why I do let here play with it while Iām watching and explain that itās dangerous to point it directly at someone and that itās very powerful so she can not adjust it with the button. This is teaching here about the dangers but still allowing here to explore. Thereās lots of things that are dangerous when not handled properly so they might as well learn instead of avoidingā¦ But if short therm exposure of the beam can be harmful itās not worth the risk of a kid not listening because there is no second chance with the eyes.
She has weak AA and AAA flashlights but itās more fun to borrow mineā¦
Maybe I should make a separate thread instead off taking this off topic :zipper_mouth_face: ?
I donāt know if itās allowed with links to another forum but this thread below was a good thread to rise awareness about lasers and might be somewhat relevant to powerful leds also so Iāll post it. Mods delete if itās not allowed. This was whatās got me thinking about eye safety. It didnāt have a good outcome but it shows how fast things can go bad.