FW3A, a TLF/BLF EDC flashlight - SST-20 available, coupon codes public

So if you used this frosted optic it will be quite floody. Then if you wanted more throw you could just polish it? That kind of seems like the best of both worlds as long as the people who want more throw were actually willing to do a little polishing.

It averages out to about 4600. Of course, there is no way of telling how informed or accurate the voters were. Some will know exactly what their real preference is, some will be judging it by a few lights they have which may not be exactly the value they believe.

Even if you provided 4600 as the average, it isn’t safe, because that 4600 would almost certainly make the 4500 crowd happy, but it might be unacceptable to either the 5000 or 4000 camps, no way of predicting the extent of that. Likewise 5000 may be ok for a larger percentage than 4000, which seems likely, or it may be the other way round if the 4000 camp are more hard-line, which may well be the case.

In order to judge real preference properly, each person would have to do something like side-by-side comparative blind testing (blind as in unknown values) of a range of otherwise equivalent lights maybe 100k apart, settle on one, and then peel off the label to reveal the calibrated value. I would love to be able to do a test like this, but it doesn’t seem realistic. If I were running a custom flashlight shop I would set up something like this, similar to having a firing range at the back of a gun shop, but there isn’t the market to support something like that.

If mentioning it gets the message delivered of a modest tint shift from ok at low current to very nice at high current, then yes.
But there is ‘green’ in the description, and ‘tint shift’, so what sticks is different from what is intended. In that case it maybe more fair to the led not mentioning it at all :slight_smile:

The XP-G3 4000K 90CRI and the XP-L2 4000K 90CRI are ugly green at all currents (as well as all 4000K 90CRI Osram Oslon leds newer than the very first generation, and the LG H35F0 4000K 90CRI), compared to which the LH351D 4000K 90CRI at low current has a wonderful tint. In fact several BLF-members are less than a fan of the rosiness of the Nichia’s, for them this Samsung led may have the perfect balance in the tint.

And perhaps it needs mentioning once more: in my experience, once using a flashlight in the real world instead of your wall, CRI has clearly more impact than tint, the tint must be really off to make a flashlight unpleasant to use.

Juste send mine without LEDs at all… even without MCPCB would be fine.
I’ll swap them anyway…
But please stay at 30$ !

I found some tint shift measurements by maukka, and the LH351D doesn’t appear to be any worse than other emitters. So, probably not worth mentioning.

Tracking says a prototype should arrive in the next 18 hours, so the plan is to do some testing on that and then put the emitter poll online. I hope the comparison data is in order now, but there’s still a little time to make corrections. Also, I’m not sure if the flood/throw pic should be included or not.


About the prototype, I have no idea what emitters it’ll have. Probably whatever was left over from other projects; the first prototype had CW XP-G2.

I’ll take 2 please.

Does it have to boil down to just one LED flavor? or is it possible to have two versions right from the start?

What I gather from the discussion of the last few days is that a single LED flavor will almost inevitably leave a good (perhaps even large) portion of potential buyers unhappy.

With two version its much more likely to please the majority.

My suggestions for that would be these two:

  • XP-L HI 5000K (highest throw, highest lumens, but low CRI & high cost)
  • Samsung LH351D 4000K 90CRI (high CRI, no extra cost, but least throw) [if the Samsungs are unobtainable for some reason > Nichia 219C 4000K 90CRI]

Both variations have their benefits.

:+1: …. Good idea if possible.

I rarely use my torches in daylight, but mostly at night, or to peer into dark places.

And I prefer light levels that don’t upset my dark-adapted eyes too much, rarely at turbo levels, often at firefly or moonlight level.

Meaning my eyes are probably operating in the mesopic or even scotopic range, rather than photopic.

I wonder whether a lot of tint preference is under artificial conditions, e.g. bouncing off white walls at close range and at high levels, whereas under my sort of usage at much lower illumination levels my eyes see the tint very differently.

I much prefer the warmer tints, 4000K or below, with good CRI, for me the difference is very marked, I don’t like cool white at-all, neutral or warm works much better. My theory is that the warmer tints, more biased towards red rather than blue, compensate for the Purkinje shift towards blue sensitivity at lower illumination levels, keeping the colours more “natural” looking.

Edit: which is why it is so difficult to take realistic photos of outdoor night-time scenes, the digital camera does not respond the same way as the human eye. Perhaps someone could develop a Purkinje shift plugin for photoshop to simulate the effect with a set of curves for different wavelengths.

I realise that those who prefer to light things up “as bright as day” may have different preferences.

I don’t have any experience with the LH351D 4000K 90CRI, but I value Djozz’s opinion. If he likes it, I’m sure it would be a great choice. Perhaps it would be best to keep the light as cheap as possible, and not go with the xpl-hi, at first. I’m sure the cheaper it is in the beginning, the more successful it will be. If its a huge hit like I’m certain it will be, hopefully more flavors will be released later with different emitter choices. This formula has worked will for the Emisar line.

Is it possible that the team test the different LEDs in the prototype and we can get numbers and beamshoots?

XPL hi is old, ineffective, with ugly CRI, and expensive. If it be used I would simply buy another D4 … I vote for any other led.

Seconded. 4000K. The floodier beam is a big plus for me too, when out searching for things that could be anywhere, possibly brown-coloured, or dripping red stuff.

I suppose when you are losing your livestock to vampire bats, 4000K high CRI is your ideal

And werewolves :wink:

Best to be prepared.

How about the Samsung LH351C (die size is in between LH351B and LH351C). It is recently introduced so probably the bins are good, it will not have the enormous flood of the 1D but should still have good output and efficiency. and it is cheap, about $0.50 when bought in quantities. (Some high CRI options ( :wink: ) : 4000K 90CRI at Digikey: https://www.digikey.com/product-detail/en/samsung-semiconductor-inc/SPHWHTL3D50GE4TPJF/1510-2323-2-ND/7560620)(5000K 90CRI: https://www.digikey.com/product-detail/en/samsung-semiconductor-inc/SPHWHTL3D50GE4RTMF/1510-2325-2-ND/8536264)

Offtopic: I don’t get the nude gnus joke.
sth. like nude news??

Moonlight mode is great for screening the suspect population

Edit: It’s surprising joke, by TK, aided and abetted by DB Custom.

A silver version, with a wooden “glass breaker” spike would be perfect, for dual use.