*BLF LT1 Lantern Project) (updated Nov,17,2020)

[Paul321]

@Tally-Ho More pics please! Looks good so far, also a brief (or lengthy ) write up is always welcome.

[hcanning]

How have I not seen this before.

Put me down for one please

[staticx57]

@ToyKeeper

@staticx57

I am not sure I like the idea of “pushing” past to edge to set auto tint. … I’ll often ramp for a while to one side to know I hit the edge.

That’s why I’m planning to add a blink when it hits the end. I’d want to add it anyway, because it’s hard to tell where the edge is… but it can also help make the auto-tint thing more intuitive. Hit the edge, keep pushing for a full second, and then it’ll go to auto. Something like that, anyway.

That is certainly another good idea. The other way to tell where the edge is to put the light on turbo/max this way we know that the other channel would not be discarded in the averaging. Blinking is welcomed

[Tjbchs]

Interested, please add me to the list.

[Tally-ho]

@Paul321

@Tally-Ho More pics please!

Sorry for the confusion, I don’t have a prototype on hand, just a picture from this message to test how the logo with exo2 font would look on it.
(Previous message edited).

[Pierre]

I am interested in 1 please.

[heysquanchy1916]

Put me down for 1!

[Marcello]

Interested in 1 as well please.

[DBSAR]

@djozz

The lumen sphere will give the numbers for comparison, if you manage to place the lantern inside, or at least stick the entire cup inside.

Measuring lux from distances will be too sensitive for brightness variations across the beam so it is not representative of total output.

the entire lantern will fit inside the sphere.

[DBSAR]

@Tally-ho

Test for logo and exo2 black font on an existing picture :

< click for full screen

Looks good :+1:

[djozz]

@DBSAR

@djozz

The lumen sphere will give the numbers for comparison, if you manage to place the lantern inside, or at least stick the entire cup inside.

Measuring lux from distances will be too sensitive for brightness variations across the beam so it is not representative of total output.

the entire lantern will fit inside the sphere.

Sorry to nitpick on the method: it helps integration quite a lot if you wrap as much as possible of the black parts of the lantern in alu-foil (but in a neat way using some cellotape so that the foil does not move too much across the measurements)

[seriesone]

Please add me to the list for one.
Thanks.

[DBSAR]

@djozz

@DBSAR

@djozz

The lumen sphere will give the numbers for comparison, if you manage to place the lantern inside, or at least stick the entire cup inside.

Measuring lux from distances will be too sensitive for brightness variations across the beam so it is not representative of total output.

the entire lantern will fit inside the sphere.

Sorry to nitpick on the method: it helps integration quite a lot if you wrap as much as possible of the black parts of the lantern in alu-foil (but in a neat way using some cellotape so that the foil does not move too much across the measurements)

Its trickier for measuring 360-degree lanterns versus directional flashlights no doubt, but will be comparing it tot its self with globe/shade on versus off, as compared to the V1 & V2 tests i done.

[beastlykings]

I think he means not relative numbers, but absolute numbers for the manufacturer?

[dubyrunning]

Sign me up for one, please!

[Nicolaas]

Interested in one too, and it would be nice to have the option to order one of these fantastic looking lanterns with a case but without batteries: I have plenty of 18650’s already……

Did I mention I think it’s looking fantastic?

Regarding the logo choice I’m with Djozz, the other one has letters that are to thick for my liking.

Thanks for all the efforts and cheers,

Nico

[Klayking]

Aah what the heck. There’s nothing wrong with my bedside lamp, but this is a lot cooler.

Put me down for one, please.

[ligonw]

I would like to be on the list!

[amars7]

Put me in for 1 please!

[djozz]

@beastlykings

I think he means not relative numbers, but absolute numbers for the manufacturer?

No, I do mean relative numbers too. Even small black things inside integrating spheres affect the amount of integration noticably, and a huge black thing like the BLF Lantern inside a relatively small sphere will effectively kill useful integration of the light output. (no good integration means that what we measure is not total light output, and comparisons can only be made with light sources with the exact same beam. While a different beam is what you want to compare here) It will be a little better than just leaving the sphere out of the setup and just position a luxmeter next to the lantern, but not much better than that. Making the lantern shiny (or even better matt white) enormously improves integration so that your measurement actually somewhat represents total light output and so you can make comparisons. Btw, also baffling the detector against direct light from the lantern would make integration better.

It is not that I want to wish to come over as some know-all, but measuring light comes with some pretty annoying rules and in theory design decisions could be off because they are based on too rough comparisons, and that would be unfortunate.