Q8, PMS SEND TO THOSE WITH ISSUES BLF soda can light

@The Miller: please add me for a second one - first is #55.
Thanks.

Thanks!

Yes patmurris, will do!

It’s amazing sometimes seeing people’s preferences for tint. There were a couple cheap zoomies laying around which appeared to have a 1-something and 0-something emitter, respectively. My sister liked it and snagged one, and she chose the 0-something tint because it looked brighter.

I can’t even call a 0 tint “white” any more. It’s so blue I’ve been tempted to use one to make an “ice blue” light saber.

Also, given a choice between a Nichia 219b 4500k 92CRI light and a XP-G2 ~5700K light (NW and CW L3 L10), she chose the XP-G2. Same reason.

OTOH, my mother filled her house with 2700K bulbs and doesn’t like 5000K bulbs. Everything there looks yellow to me.

I guess I’m the odd one out because I like daylight tints, 4500-5000K.

Thanks so much for all your doing. I would like another one. I’m at 1306 now.

5000K is best tint for me.
Don’t like yellow, and don’t like blue…

TK, it could be age or what one has for lighting in the home. I can see the difference in °K when a light is first turned on, but then I become immune to it. I make the claim that it makes little difference to me. Of course one that is hugely blue or yellow might bother me. We have a floor lamp next to my chair that has a daylight LED bulb for area lighting, and the reading light is warmer. I can see it when they’re both turned on, then nothing, it’s just light unless I look directly at the bulb.

Yeah, I don’t claim to understand it in depth. I bet your mom is accustomed to low wattage incandescents and doesn’t want to change. Personally, phooey on those days. I if want those days I’ll cut the power and bring out the kerosene lights. Yeah, that’s not happening unless it’s TEOTWAWKI and my PV system has pooped itself.

Older people spent more time with orange tinted incandescent lighting, it’s “normal” for them. They feel like a daylight white is burning too much electricity and turn it off.

I like daylight white myself, as close to pure white as I can get it without any tint one way or another.

Edit: Should also add that once I find it white to my liking, I like to make it bright enough to burn through your eyes and come out the back of your head. :smiley:

I prefer warm white home lighting and I’m not old!

Ativistic memories. It’s said that when we lived in caves and/or camped out, the firelight was our only source of light and we all know what color that is. So our ancestral beginnings conditioned us to have warm white lighting, it is even said that it starts us off towards bedtime, the gradual decline of our lighting condition prepares us to call it quits.

Nowadays it simply isn’t so, but the age old preference for warm white household lighting is still strong in a great many, even those that can’t admit they are aging, gracefully or otherwise. :wink:

> why would you want to replace LEDs every few years?

The rate at which they’re being improved is awesome; the old saying “nothing gets old faster than computers except fresh fruit” could apply to LEDs too.

> warm white … sleep

There is much good and very recent science on that subject:
https://www.google.com/search?q=blue+light+sleep
https://scholar.google.com/scholar?oe=utf-8&um=1&ie=UTF-8&lr&cites=15026390498755012324

You likely learned about “three color receptors” for vision. Turns out there are four receptors.
We have that receptor. Dinoflagellates have the same receptor. It’s rather basic stuff to how life works, evolutionarily very old.
Life adapted to blue daylight skies a long, long time ago.

Looping back to the first question — one thing I often do is replace white LEDs with amber emitters, to use at night.
And those too have been improving rapidly as the market for sleep-protecting illumination begins to develop.

On the opposite side of some of this theory, if I have to work into the night cutting up a felled tree to clear a road or looking for a lost puppy, whatever, I don’t want warm white light making me sleepy! :stuck_out_tongue:

Yep, Dale — light with the peak output right at the blue-green spike that “white” LEDs emit is the key to keeping you wakeful and alert.
I had a 7-year-old neighbor who discovered this himself, long ago. He told me he was sneaking his under-the-blanket late nighttime video gaming/reading using a blue LED penlight because it kept him alert.

Takes a couple of hours for most people after the last exposure to blue-green light before the body starts letting melatonin accumulate and sleepiness begins.
And it takes very little ‘white’ light to reset that 2-hour countdown clock.

I’ve read that the amber night lights are very helpful to parents who want their babies not to stay awake after nighttime feeding, too.

https://www.google.com/search?q=melatonin+wavelength+LED&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjloJXdxYLUAhWpqlQKHS07DzYQ_AUICygC&biw=1312&bih=895#imgrc=HFDA6iIN-tIFZM:

I definitely prefer light on the warmer side of neutral. I like the compact fluorescent bulbs for being energy efficient, but they start at a warm white and go to a harsh white. Glad led bulbs in nice warm tints are available at an affordable price now.

Indeed, there is. Blue light activates the IPRCGs, which tells the brain to make wakey-wakey chemicals. In most people. About 19,997 out of every 20,000 people, really. I’m one of those other 3. And, statistically, the other 2 are blind. So I’m … nocturnal. And morning people are weird.

Anyway, the smoke grenade pouch showed up and fits my SRK well. Shipping was stupid-fast too. I ordered on Saturday and it arrived on Monday. Considering USPS has Sundays off, that’s like one-day shipping.

I suppose it sort of fits my BST too, but it doesn’t slide in far enough to reach the bottom, and the velcro is a bit short for a good grip. It’s still usable, but not ideal… a shallower or wider pouch would work better. What this one really needs is a Q8.

D@&$ right Dale, you won’t hear me admitting it!

Nice TK

Tint preference is personal for sure.
I like neutral for flashlights but in the home we have changed all white halogen and those annoying “energy saving bulbs” for LEDs after a few months of living here.
3700K and now I buy warm white from China and these match very well.
Candles give a yellowish light and dimmed during dinner or something it just is a nice atmosphere white cannot give IMHO

I found a likely problem with my Q8 when using short batteries like my solder blobbed 30Q's and BD's. I was testing the light output with 1 to 4 batteries, on both types mentioned above, when unexpectedly on 3 BD's the ouput was not better than on 2 BD's. And this is what caused it:

The springs are loosing tension which caused one battery not to touch the batt+ contact ring on the driver. This may be caused by the one battery test that causes quite some current through the battery spring. The springs are in no way collapsed, they look and feel ok, but they are a bit shorter than before. Perhaps the best solution (I think we want to be able to use these short batteries in the Q8) is the use of bigger springs (longer, thicker wire). Another solution would be a shorter battery tube, but that will limit the battery size range a bit.

So I tried to fix it by sanding the battery tube shorter. I thought that because the head falls fully over the battery tube that that was no problem, but unfortunately the threading on the battery tube has a hard stop at the end, so by shortening the tube I lost contact with the driver

So to fix that the nice plastic ring had to go and a copper wire was soldered on the edge of the batt- ring

And I got contact again. I get 5725 lumen on 30Q's, like before

Btw, here are the results of the light output on different numbers of batteries. I chose the 30Q because that will be the most widely used battery for the Q8, and BD’s because that is the only lower drain battery (but still pretty high drain though) that I have 4 of and solder blobbed. Outputs were measured after 30 seconds on the highest setting:

Samsung 30Q:
1 cell: 2535 lm
2 cells: 4330 lm
3 cells: 5130 lm
4 cells: 5350 lm

NCR18650BD:
1 cell: 2510 lm
2 cells: 3480 lm
3 cells: 4340 lm
4 cells: 4970 lm

Some notes:
*on 1 BD battery, the LVP kicked in at 32 seconds (output drop)
*the output on 4 30Q’s should be 5700 lumen, as I re-tested later. Two possible causes: This test was done before shortening the battery tube, so one battery may already have had poor contact. And also I did not recharge the batteries after each 30 second run, just added a freshly charged one every time, so 3 out of 4 cells were already slightly depleted.

Interesting. The double springs should lessen the effect of them losing tension correct? That could be quite the pain I planned to use solder blobs.