The little lantern mod (part I+part II), finished

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djozz
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The little lantern mod (part I+part II), finished

I wanted to make a small lantern based on the Utorch UT01, with a campfire/candle colour temperature (2200K). There are not many leds in that colour temperature, I know that the Nichia E21 comes in that tint but Clemence does not have it (yet).

So I came across this über-obscure led at RS-online, the Stanley Electric GSPW1651NSE-20Y-TR Party . It is a 5050-size japanese mini-COB led with 6 parallel midpower leds in one tiny LES (datasheet). Rated at max 600mA, 85CRI and just 81 lm/W this led will not win any performance contest. But it is 2000K!, that should create some cuddly atmosphere.

I did a quick voltage/output test on one of my 119-boards to see if it would survive the 600-ish mA that the Utorch UT01 provides on an Eneloop.

So the led is ok at least up to 1250mA and should be fine in the Utorch and give a bit under 100 lumen OTF, which is fine for a lantern.

So it was soldered into the UT01 (after the board was sanded down to 13.5mm diameter). To fit the larger than stock led under the reflector the centering piece was left out and the corners of the led filed off a bit with a small diamond file. It all worked and indeed very warm the tint is! Shocked , almost as orange as a PC-amber led, but unlike the amber led there is some of the blue side of the colour spectrum leftover, the tint is just extremely warm.

A peek into the reflector shows the six distinct leds. Of course that affects the beam, a royal donut hole is the result. But it will be a lantern so that is no problem.

I get 88 lumen on the highest setting, and 0.8 lumen on the lowest, a good range for the lantern.

Part II will be the lantern conversion, when I have time to finish it I will post about it.

_____________________________________________

Part II, the lantern conversion.

This part was intended to look a bit more professional, but the used techniques were a first for me, it was not as easy to get it slick looking.

First I bought a rod of 15mm diameter solid acrylic, that fits almost tight through the bezel of the UT01. A piece of it was cut off, first a 2.5mm hole was drilled in the top, then with a countersink drill a conical hole was drilled. The deepest part of the 2.5mm hole was M3-tapped. A conus was bent from a piece of aluminium foil. And a 16.5mm diameter replacement lens was made from a sheet of acrylic (it looks blue because of the protecting foil).

The plastic on the inside of the conus was liquified partly with a cotton-swab drenched in chloroform, then the aluminium foil was rubbed in place using the swab.

The tail-side of a two-pence coin was filed flat (I would not do that to the queen) and three holes were drilled in it (one through her ear, I reckoned I would get away with that), a hex-screw was used to screw it on top of the optic. The acrylic was sawed to the correct height.

The 16.5mm acrylic lens was glued on the underside of the optic with chloroform, not crystal-clear unfortunately but it will do the job fine. Here it is shown with the bezel already around it.

And here’s the finished light. I painted the coin with matt black heater paint, that did not cover her majesty 100% but it is kind of fun that you can still see that it is a coin.

And the beam is pretty nice, mainly going sideways in all directions. The output is 51 lumen on max, while out of the reflector without the optic on top came 94 lumen. So the optic caused 45% light loss, a manufacturer should be able to improve on that Wink

I’m happy with the result, as said less perfect looking than intended, but it is a nice little tent lantern that will certainly make me very happy during my camping trips Smile

link to djozz tests 

“I used to think that top environmental problems were biodiversity loss, ecosystem collapse and climate change. I thought that thirty years of good science could address these problems. I was wrong. The top environmental problems are selfishness, greed and apathy, and to deal with these we need a cultural and spiritual transformation. And we scientists don’t know how to do that.”   (Gus Speth)

Edited by: djozz on 12/27/2017 - 18:53
MRsDNF
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Very nice mod djozz. Just need a shot of a bottle of wine with you light shining on it. Smile

My current and or voltage measurements are only relevent to anything that I measure.

Budget light hobby proudly sponsored by my Mastercard and unknowingly paid for by a hard working wife. 

djozz said "it came with chinese lettering that is chinese to me".

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djozz
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MRsDNF wrote:
Very nice mod djozz. Just need a shot of a bottle of wine with you light shining on it. Smile

Thanks, right, here’s the proper beamshot:

link to djozz tests 

“I used to think that top environmental problems were biodiversity loss, ecosystem collapse and climate change. I thought that thirty years of good science could address these problems. I was wrong. The top environmental problems are selfishness, greed and apathy, and to deal with these we need a cultural and spiritual transformation. And we scientists don’t know how to do that.”   (Gus Speth)

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Very nice!

You’ve got me wanting a very warm Eneloop-powered ‘mood light’ now…

edeekeos
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that is stunning! such a warm tint!

DavidEF
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Nice! Even though I don’t particularly like very warm tints in real life. Silly

Reason is not automatic. Those who deny it cannot be conquered by it. Do not count on them. Leave them alone.
-Ayn Rand

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djozz wrote:
MRsDNF wrote:
Very nice mod djozz. Just need a shot of a bottle of wine with you light shining on it. Smile

Thanks, right, here’s the proper beamshot:
!{width:40%}https://farm5.staticflickr.com/4484/37740897921_7c5a8298b3_c.jpg!

Perfect. Now how do I get my darling wife to be romantic? Love

My current and or voltage measurements are only relevent to anything that I measure.

Budget light hobby proudly sponsored by my Mastercard and unknowingly paid for by a hard working wife. 

djozz said "it came with chinese lettering that is chinese to me".

old4570 said "I'm not an expert , so don't suffer from any such technical restrictions".

Old-Lumens. Highly admired and cherished member of Budget Light Forum. 11.5.2011 - 20.12.16. RIP.

 

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Nice mod Smile i have a few micro LEDs in that tint range of flame of a candle, but they are to small for in a flashlight host.

That Canadian flashlight guy & Lantern Guru -Den / DBSARlight

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Should be cool Thumbs Up

Ice
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Nice light to get your girl in the mood . Sadly not enough light to find her

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djozz wrote:
MRsDNF wrote:
Very nice mod djozz. Just need a shot of a bottle of wine with you light shining on it. Smile

Thanks, right, here’s the proper beamshot:

 

I don’t know what’s the better vintage, the wine or the lighting.

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really nice tint, perfect for fall and Halloween. I often wonder how creative some users are with sourcing exotic LEDs Smile
interesting mod and I am looking forward to seeing the lantern.

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It looks real warm (was gonna say cool but….)
But I gotta ask, if you want a real warm yellow collor why not go for an amber colored? I’m just curious…

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dekozn wrote:
But I gotta ask, if you want a real warm yellow collor why not go for an amber colored? I’m just curious…

Because of the CRI. Low-pressure sodium gas lamps are way warm but their tint is AWFUL, because they have atrocious CRI.

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Jack Kellar wrote:
dekozn wrote:
But I gotta ask, if you want a real warm yellow collor why not go for an amber colored? I’m just curious…

Because of the CRI. Low-pressure sodium gas lamps are way warm but their tint is AWFUL, because they have atrocious CRI.

Yes, I have a flashlight with a PC-amber led in it, which already has a wider spectrum as a normal amber led, but still the blue region is completely absent. This led still has some blue in it so blue colours do appear a bit blue instead of grey.

link to djozz tests 

“I used to think that top environmental problems were biodiversity loss, ecosystem collapse and climate change. I thought that thirty years of good science could address these problems. I was wrong. The top environmental problems are selfishness, greed and apathy, and to deal with these we need a cultural and spiritual transformation. And we scientists don’t know how to do that.”   (Gus Speth)

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Nice work Djozz !

About the donut hole , could it be from the wrong focus of the reflector ? I could be totally wrong …

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Nice, now you just need to make it flicker and you’ll have a nice campfire

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Cuddling afterwards….

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As a French person, I’m irritated by that screw-on cap on a bottle of wine… but I DO enjoy the scenery Smile
Nice lantern ! I love my 219C 2700K for ambient lighting !

"Hey -X3-, do you have a flashlight ?"   "-X3-, can I borrow one of your flashlights ?" 

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FireFlyMod wrote:

X3 wrote:
As a French person, I’m irritated by that screw-on cap on a bottle of wine… but I DO enjoy the scenery Smile Nice lantern ! I love my 219C 2700K for ambient lighting !

Bah… C’est plus une affaire d’esthétisme…undecided


Finalement, si tu réfléchis bien, le bouchon à viser est techniquement meilleur que liège.

La 219C est excellente! +1


Faut bien défendre les traditions, “on a toujours fait comme ça” Party
30 ans et déjà réac’, ça promet !

"Hey -X3-, do you have a flashlight ?"   "-X3-, can I borrow one of your flashlights ?" 

My Flashlight public album (mods, emitter swaps, eye candy)

My reviews channel (French language, Olight, Thorfire, Sofirn, Lumintop : 60+ lights tested)

My personal channel (including Olight SR mini, S1, S2, S1A and S-mini disassembly)

M4DM4X blog, saves you $$$ 

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Next time I will picture a wine bottle with a cork! Smile

I finished the lantern, see the OP.

link to djozz tests 

“I used to think that top environmental problems were biodiversity loss, ecosystem collapse and climate change. I thought that thirty years of good science could address these problems. I was wrong. The top environmental problems are selfishness, greed and apathy, and to deal with these we need a cultural and spiritual transformation. And we scientists don’t know how to do that.”   (Gus Speth)

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“…drenched in chloroform….” Sick
Did you fell asleep in the process?

Nice idea, I’ll make my lantern soon. We have the 2000K now.

- Clemence

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I did the choroform work outside on the balcony Smile

Yes, I would have used your 2000K E21A if it had been available when I did the led swap, it is probably more efficient too. Please post about your lantern when you are making it!

link to djozz tests 

“I used to think that top environmental problems were biodiversity loss, ecosystem collapse and climate change. I thought that thirty years of good science could address these problems. I was wrong. The top environmental problems are selfishness, greed and apathy, and to deal with these we need a cultural and spiritual transformation. And we scientists don’t know how to do that.”   (Gus Speth)

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Perfect. Now how do I get my darling wife to be romantic? :LOVE:[/quote]

I advise leaving Flashlights out of the equation————— Smile

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[/quote]How do I get my darling wife to be romantic?

Chloroform

καὶ τὸ φῶς ἐν τῇ σκοτίᾳ φαίνει καὶ ἡ σκοτία αὐτὸ οὐ κατέλαβεν

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Boaz wrote:
How do I get my darling wife to be romantic?

Chloroform

Do you know where I can get this in bulk? Facepalm

My current and or voltage measurements are only relevent to anything that I measure.

Budget light hobby proudly sponsored by my Mastercard and unknowingly paid for by a hard working wife. 

djozz said "it came with chinese lettering that is chinese to me".

old4570 said "I'm not an expert , so don't suffer from any such technical restrictions".

Old-Lumens. Highly admired and cherished member of Budget Light Forum. 11.5.2011 - 20.12.16. RIP.

 

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MRsDNF][quote=Boaz wrote:
How do I get my darling wife to be romantic?
Chloroform

Quote:
Do you know where I can get this in bulk? Facepalm

I had chocolate milk running from my nose, reading that response

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MRsDNF wrote:
Boaz wrote:
How do I get my darling wife to be romantic?

Chloroform

Do you know where I can get this in bulk? Facepalm


You have so many wives?