A Perfect Dedome?

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Tom E
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ryansoh3 wrote:
Great, thanks for letting me know. How long do you dip it in gasoline?

You can monitor to see if the dome falls off or is loosened, maybe 2-10 hours, or you can pull it out in 2-4 hours and poke it gently to see if it will easily be pushed/flipped up and off. Lately I've been doing the shorter time (2 hrs), and carefully flipping it off, starting from the side opposite the wires. Overnight takes the guess work out of it. Most of the time now I see a bubble forming under the dome, indicating the dome' seal has been compromised. At that point it comes off pretty easy.

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Gotcha. Is there a sweet spot in terms of hours under gasoline, or is there a greater probability of success with longer times?

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ryansoh3 wrote:
ohaya wrote:

Hi,

How much gasoline do you get for $2 in Seoul…. like a thimble-ful :)?

:bigsmile:

About a liter of regular gasoline. Just under a liter for premium though.

The high gas prices only affect the poor and middle class though, the rich still drive their gas guzzlers like there is no tomorrow.

Damn, it’s like 150-170 cents per litre for premium here in Melbourne.

Slewflash 

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ryansoh3 wrote:
Gotcha. Is there a sweet spot in terms of hours under gasoline, or is there a greater probability of success with longer times?

There's no such thing as 'too long', just leave it in until the dome floats off on its own. If you lightly score the dome with a razor just enough to break the outer skin it can happen in as little as 30 minutes.

Tom E
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Good point comfy on the dome cuts - gotta try that on my next de-dome.

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Yeah, all our oil is imported… very pricey. :~

Thanks guys for all your help, I’ll try dedoming once my XM-L2’s arrive. Big Smile

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anyone have any longevity issues after dedome?

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djozz wrote:

djozz wrote:

dct73 wrote:
I can see it

Thanks

Tom E wrote:

That’s amazin stuff! I guess you could reflow, then de-dome in one fell swoop! I assume that’s an XP-G2 – you are a better man than I — I never would have attempted a de-dome technique the first time on a XP-G2.

I did reflow and with the led still hot dedomed it, the video is one shot (and perhaps a lucky one Innocent). The led is a XP-E2 R3, 1D tint.

It is going into my ‘budget test-thrower’ (49mm reflector, led 2A), just to see what an extreme pencil beam will look like <img src="/sites/all/libraries/tinymce/jscripts/tiny_mce/plugins/emotions/img/smiley-cool.gif" alt="Cool" title="Cool" border="0">. I may do a beamshot and some lux-readings if it gets finished this weekend <img src="/sites/all/libraries/tinymce/jscripts/tiny_mce/plugins/emotions/img/smiley-smile.gif" alt="Smile" title="Smile" border="0">.</p><p></blockquote></p><p>ok, I was inspired by the post of zizo and quickly finished the mod mentioned above. Just two pictures, hope you don't mind, Tom? (I do not want to derail this thread):</p><p><img src="http://farm9.staticflickr.com/8380/8623539820_3280eeef47_b.jpg" height="713" width="952"></p><p>reflector 49mm, dedomed XP-E2 R3 1D-tint on copper, screwed on pill, arctic silver in between , driver LD25 2.0A, tailcap:2.0A. Ceiling bounce lumen estimate: 290 lumen. Throw (measured at 2 meter,3 meter and 5 meter, same results): 170klux1m Cool (165klux after 5 minutes), functionality: zero, this is an utterly useless flashlight.

beamshot:

Hey Djozz, that there flashlight wouldn’t be utterly useless to me!!!!

and the lord did utter….‘let there be light’……..and CREE said ‘how much?’

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I did my first de-dome last night on a Crelant V21A XM-L.  I don't have the know-how to remove the whole LED so I just unscrewed the reflector so the emitter was sticking out the end of the light and submerged the top 5mm or so into a shot glass with a little gasoline at the bottom.  The dome slid RIGHT off this morning EASY as pie and darn near perfectly. 

My only question is how do I get the gasoline smell off?

I ran the head very gently under water to rinse off some of the gasoline and let it sit out all day to fully dry but it still wreaks of gasoline since the metal was submerged somewhat. Obviously I can't really use any chemicals or anything get the smell off...what about just leaving it out in the sunlight? Would that be bad on the bare emitter?

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ThirstyTurtle wrote:

I did my first de-dome last night on a Crelant V21A XM-L.  I don't have the know-how to remove the whole LED so I just unscrewed the reflector so the emitter was sticking out the end of the light and submerged the top 5mm or so into a shot glass with a little gasoline at the bottom.  The dome slid RIGHT off this morning EASY as pie and darn near perfectly. 

My only question is how do I get the gasoline smell off?

I ran the head very gently under water to rinse off some of the gasoline and let it sit out all day to fully dry but it still wreaks of gasoline since the metal was submerged somewhat. Obviously I can't really use any chemicals or anything get the smell off...what about just leaving it out in the sunlight? Would that be bad on the bare emitter?

Please use isopropryl alcohol - rinse it - works well with a squeeze bottle.  The alcohol is relatively cheap at drug stores (maybe supermarkets too). I use it every time, works well. Actually I use it a ton on cleanups, solder flux, etc...

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Tom E wrote:

ThirstyTurtle wrote:

I did my first de-dome last night on a Crelant V21A XM-L.  I don't have the know-how to remove the whole LED so I just unscrewed the reflector so the emitter was sticking out the end of the light and submerged the top 5mm or so into a shot glass with a little gasoline at the bottom.  The dome slid RIGHT off this morning EASY as pie and darn near perfectly. 

My only question is how do I get the gasoline smell off?

I ran the head very gently under water to rinse off some of the gasoline and let it sit out all day to fully dry but it still wreaks of gasoline since the metal was submerged somewhat. Obviously I can't really use any chemicals or anything get the smell off...what about just leaving it out in the sunlight? Would that be bad on the bare emitter?

Please use isopropryl alcohol - rinse it - works well with a squeeze bottle.  The alcohol is relatively cheap at drug stores (maybe supermarkets too). I use it every time, works well. Actually I use it a ton on cleanups, solder flux, etc...

Great! So does the alcohol help with the smell or is it just good practice to clean everything when finished?

Also, I have "Rubbing Alcohol", is that the same as "Isopropyl Alcohol"?

Thanks!

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Should help with the smell, yes I'm think'n, but I can't smell as well as I used to... hhmm, that sounds weird... Undecided Well, dunno if it's the same, maybe look it up on wikipedia?

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Stockton-Rob wrote:
djozz wrote:

djozz wrote:

dct73 wrote:
I can see it

Thanks

Tom E wrote:

That's amazin stuff! I guess you could reflow, then de-dome in one fell swoop! I assume that's an XP-G2 - you are a better man than I -- I never would have attempted a de-dome technique the first time on a XP-G2.

I did reflow and with the led still hot dedomed it, the video is one shot (and perhaps a lucky one Innocent). The led is a XP-E2 R3, 1D tint.

It is going into my 'budget test-thrower' (49mm reflector, led @2A), just to see what an extreme pencil beam will look like Cool. I may do a beamshot and some lux-readings if it gets finished this weekend Smile.

ok, I was inspired by the post of zizo and quickly finished the mod mentioned above. Just two pictures, hope you don't mind, Tom? (I do not want to derail this thread):

reflector 49mm, dedomed XP-E2 R3 1D-tint on copper, screwed on pill, arctic silver in between , driver LD25 2.0A, tailcap:2.0A. Ceiling bounce lumen estimate: 290 lumen. Throw (measured at 2 meter,3 meter and 5 meter, same results): 170klux@1m Cool (165klux after 5 minutes), functionality: zero, this is an utterly useless flashlight.

beamshot:

Hey Djozz, that there flashlight wouldn't be utterly useless to me!!!!

LOL, the flashlight doesn't exist anymore, I put the led in a c8 pill with a 2amp driver as a drop-in for my Uniquefire UF-t20. The test-thrower host is now empty, waiting for a next experiment Smile

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ThirstyTurtle wrote:

I did my first de-dome last night on a Crelant V21A XM-L.  I don’t have the know-how to remove the whole LED so I just unscrewed the reflector so the emitter was sticking out the end of the light and submerged the top 5mm or so into a shot glass with a little gasoline at the bottom.  The dome slid RIGHT off this morning EASY as pie and darn near perfectly. 

My only question is how do I get the gasoline smell off?

I ran the head very gently under water to rinse off some of the gasoline and let it sit out all day to fully dry but it still wreaks of gasoline since the metal was submerged somewhat. Obviously I can’t really use any chemicals or anything get the smell off…what about just leaving it out in the sunlight? Would that be bad on the bare emitter?

Another one of the benefits of using thinners. When I pull mine out, the thinners evaporates almost instantly. No residue or smell. It’s great!

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djozz wrote:

djozz wrote:

dct73 wrote:
I can see it

Thanks

Tom E wrote:

That’s amazin stuff! I guess you could reflow, then de-dome in one fell swoop! I assume that’s an XP-G2 – you are a better man than I — I never would have attempted a de-dome technique the first time on a XP-G2.

I did reflow and with the led still hot dedomed it, the video is one shot (and perhaps a lucky one Innocent). The led is a XP-E2 R3, 1D tint.

It is going into my ‘budget test-thrower’ (49mm reflector, led 2A), just to see what an extreme pencil beam will look like <img src="/sites/all/libraries/tinymce/jscripts/tiny_mce/plugins/emotions/img/smiley-cool.gif" alt="Cool" title="Cool" border="0">. I may do a beamshot and some lux-readings if it gets finished this weekend <img src="/sites/all/libraries/tinymce/jscripts/tiny_mce/plugins/emotions/img/smiley-smile.gif" alt="Smile" title="Smile" border="0">.</p><p></blockquote></p><p>ok, I was inspired by the post of zizo and quickly finished the mod mentioned above. Just two pictures, hope you don't mind, Tom? (I do not want to derail this thread):</p><p><img src="http://farm9.staticflickr.com/8380/8623539820_3280eeef47_b.jpg" height="713" width="952"></p><p>reflector 49mm, dedomed XP-E2 R3 1D-tint on copper, screwed on pill, arctic silver in between , driver LD25 2.0A, tailcap:2.0A. Ceiling bounce lumen estimate: 290 lumen. Throw (measured at 2 meter,3 meter and 5 meter, same results): 170klux1m Cool (165klux after 5 minutes), functionality: zero, this is an utterly useless flashlight.

beamshot:

Djozz,

You are the one of “pencil beam haters guys” :). I have all types of flashlights.

Well I just want to say few words to you and other guys that are sharing same opinion with you.

There are no thing as unusable light. You just did not find use for such lights.

Pencil beam?
I will give only one example(there are more but I don’t have will for describing). Your flashlight is perfect riflescope reflector light, although I prefer aspherics beam better(I described several times why I prefer aspheric, especially for hunting).
Distant spotting and small size light is very important for this type of hunting. You can not mount bigger reflectors like Olight SR95 TN31 on your rifle.

Your tuned Jacob from picture(you did not have to cut reflector in order to perfectly center the beam) really can throw claimed numbers. It can throw even more than that with XP-E2 with slightly larger hotspot than on your picture.

But really nice job. I recommend only gasoline de doming for XP-E2.

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ThirstyTurtle wrote:

Tom E wrote:

ThirstyTurtle wrote:

I did my first de-dome last night on a Crelant V21A XM-L.  I don’t have the know-how to remove the whole LED so I just unscrewed the reflector so the emitter was sticking out the end of the light and submerged the top 5mm or so into a shot glass with a little gasoline at the bottom.  The dome slid RIGHT off this morning EASY as pie and darn near perfectly. 

My only question is how do I get the gasoline smell off?

I ran the head very gently under water to rinse off some of the gasoline and let it sit out all day to fully dry but it still wreaks of gasoline since the metal was submerged somewhat. Obviously I can’t really use any chemicals or anything get the smell off…what about just leaving it out in the sunlight? Would that be bad on the bare emitter?

Please use isopropryl alcohol – rinse it – works well with a squeeze bottle.  The alcohol is relatively cheap at drug stores (maybe supermarkets too). I use it every time, works well. Actually I use it a ton on cleanups, solder flux, etc…

Great! So does the alcohol help with the smell or is it just good practice to clean everything when finished?

Also, I have “Rubbing Alcohol”, is that the same as “Isopropyl Alcohol”?

Thanks!

Yes, I think it’s the same.

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luminarium iaculator wrote:
Djozz, You are the one of "pencil beam haters guys" :). I have all types of flashlights. Well I just want to say few words to you and other guys that are sharing same opinion with you. *There are no thing as unusable light. You just did not find use for such lights.* *Pencil beam?* I will give only one example(there are more but I don't have will for describing). Your flashlight is perfect riflescope reflector light, although I prefer aspherics beam better(I described several times why I prefer aspheric, especially for hunting). Distant spotting and small size light is very important for this type of hunting. You can not mount bigger reflectors like Olight SR95 TN31 on your rifle. Your tuned Jacob from picture(you did not have to cut reflector in order to perfectly center the beam) really can throw claimed numbers. It can throw even more than that with XP-E2 with slightly larger hotspot than on your picture. But really nice job. I recommend only gasoline de doming for XP-E2.

There was someone who mentioned spotting buoys in the night when on a boat, pencil beams reach far and do not put out distracting light nearby. So there are indeed one or two applications, so I'll change my opinion of pencil beam flashlights to 'fairly useless' Tongue Out. Did I also mention that they are fun? Smile I think that 'useless' and 'fun' are very close to each other Laughing.

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djozz wrote:
 I think that 'useless' and 'fun' are very close to each other Laughing.

 

LOL

+1

So true...

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I live in California where the gas has lots of additives so I use white gas (Coleman stove fuel). It doesn’t smell as much. I grind down the SinkPAD if it’s going into a pill that only holds a 14mm then reflow on the LED. I had LED’s slide off from the heat melting the solder from grinding. I then put them in a small jar of white gas for at least 24 hours up to 7 days. Bump the dome with a tooth pick and it falls off. After an hour I test it with a small cell with test leads to see if it works, solder it into a light and burn off the smell.

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I think that you are not serious man talking like that. But you are from Amsterdam so that is ok Smile

Fun? If you call 600-800 meters distance spotting fun than fun it is. For me this is some serious fun, joy and need.

To carry one small Nightmaster V2 in jacket pocket or 1,5-2kg flashlight with belt around my neck :Sp?

Not to mention that you will see further in the night with such flashlights. KCD values sometimes means nothing it is important what you can see in the night.

Well city guys in their suburbs really don’t need such flashlights I will admit you that but you would change your mind on “pencil beam” on one of my live presentations of flashlights.

Rubum:

Don’t do that. U can never get rid of smell like that. I know because I tried. Use Isoproply alchol emitter bath after de-doming. It kills any gas smell + it cleans surface.

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luminarium iaculator wrote:
I think that you are not serious man talking like that. But you are from Amsterdam so that is ok Smile Fun? If you call 600-800 meters distance spotting fun than fun it is. For me this is some serious fun, joy and need. To carry one small Nightmaster V2 in jacket pocket or 1,5-2kg flashlight with belt around my neck :Sp? Not to mention that you will see further in the night with such flashlights. KCD values sometimes means nothing it is important what you can see in the night. Well city guys in their suburbs really don't need such flashlights I will admit you that but you would change your mind on "pencil beam" on one of my live presentations of flashlights. Rubum: Don't do that. U can never get rid of smell like that. I know because I tried. Use Isoproply alchol emitter bath after de-doming. It kills any gas smell + it cleans surface.

Yes, for me as a city guy I never need a flashlight, the last power cut here was 10 years ago and if you look at satellite images at night you can see that in the Netherlands there is no place where it ever gets really dark. So for me flashlights are a hobby and I like to explore the limits of what can be made of them, and the concept of really needing a flashlight is quite alien to me, I am quite (but happily Smile ) surprised if anything new that I build is actually something very useful for someone. So thanks for pointing out the usefulness of pencil beams, it makes the hobby even more fun knowing that Cool.

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djozz wrote:

luminarium iaculator wrote:
I think that you are not serious man talking like that. But you are from Amsterdam so that is ok Smile Fun? If you call 600-800 meters distance spotting fun than fun it is. For me this is some serious fun, joy and need. To carry one small Nightmaster V2 in jacket pocket or 1,5-2kg flashlight with belt around my neck :Sp? Not to mention that you will see further in the night with such flashlights. KCD values sometimes means nothing it is important what you can see in the night. Well city guys in their suburbs really don’t need such flashlights I will admit you that but you would change your mind on “pencil beam” on one of my live presentations of flashlights. Rubum: Don’t do that. U can never get rid of smell like that. I know because I tried. Use Isoproply alchol emitter bath after de-doming. It kills any gas smell + it cleans surface.

Yes, for me as a city guy I never need a flashlight, the last power cut here was 10 years ago and if you look at satellite images at night you can see that in the Netherlands there is no place where it ever gets really dark. So for me flashlights are a hobby and I like to explore the limits of what can be made of them, and the concept of really needing a flashlight is quite alien to me, I am quite (but happily Smile ) surprised if anything new that I build is actually something very useful for someone. So thanks for pointing out the usefulness of pencil beams, it makes the hobby even more fun knowing that Cool.

If it’s not really dark, then logically one avoids more ‘light pollution’ in the form of fat beam and spill. So there’s another use for a skinny thrower. Smile

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I made a short video doing a hot dedome here...

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Anyone ever try a silicon digestant like Dow Corning DS-2025?

I have some on order. I’m looking forward to seeing how well it performs. Seems like this stuff would effect the perfect de-dome: unlike solvents, digestants leave no traces of silicone.

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There's only a residue left after using gasoline if you choose not to flick it off with a toothpick. No matter how many times you try to reinvent the wheel the end product is still gonna be something round that rotates around a central axis. Gas works, is readily available even in parts of the world that don't have indoor plumbing, doesn't have to be ordered from some specialty supplier, and won't harm the LED.

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Mfrey…

I think all should stick to gasoline. After gasoline bath use Isoproply alcohol splash cleanup and surface is clean as it never been de-domed after all.

Stick to verified things.

You should all read this funny post in this thread. This was hilarious to me Big Smile It has deep message. It is about different ways of de-doming. I will quote it:

“There may be an even better way. All you have to do is build a rocket to launch the LED to fly close to the sun to heat up the dome, then a super-intelligent robot can poke it with a pin and peel the dome off. Do you think that might work better than just dunking the damn thing in gasoline and then a few hours later like magic you have a freshly de-domed LED?”

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I’m going to try it. Worst case scenario, I’m out $5. I think it’s going to work beautifully.

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Hey Mfrey,

I was apprehensive about using petrol (gasoline) to do any dedome work.

I’ve dedomed 6 emitters, with only 1 failure, and even then, it wasn’t down to the gas, it was down to two gold wires coming away with the dome, and it was a difficult XR-E emitter with the small metal ring anyways, and I’d hung the emitter upside down in the ‘dedome tank’ (a small jar for making home made jam), so when the dome fell away and took all the ‘goo’ from underneath….the wires fell away too. I suspect a sub-standard, or even a counterfeit Cree emitter quite frankly!

I’ve even dedomed an XP-E……..tiny thing it is, turned a Small Sun ZY-C10S into a laser!

Just grow a pair and do it! I used a razor blade to score the domes several times, it speed up the process.

To clean, I use a 35mm film roll canister, filled halfway with methylated spirits, don’t know what it’s called over in the States, and swirled the stars for a few minutes, then I used, well, an old tshirt cut into squares, I can feel the emitter edges better you see, I removed the excess spirits, then I use a hairdryer, set at cool, at around 30cm away from the star, and blow dry it for a few minutes on high speed.

No gas smell, and a nice clean, bright star!

Hope this helps my friend.

Rob

and the lord did utter….‘let there be light’……..and CREE said ‘how much?’

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I have used gas and it works pretty well. I agree. I’m trying the DS as an experiment. I won’t belabor the point but this stuff was formulated to do exactly what we want a solvent to do for de-doming: quickly and completely remove cured silicone without otherwise damaging the substrate. It even washes off with water when it’s done.

I was going to post results afterwards but folks seem resistant to something new, so anyway…

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I don't think anybody here is resistant to anything just because it's new. Personally I'm resistant to things that don't work as well or aren't as convenient. If this DS were available at every corner store in the world and cheaper than gasoline I'd be all over it.

Say someone proposed switching all road vehicles over to square wheels, and had proof that they work just as well as round wheels as long as you cut all the roads with the appropriate washboard pattern so the ride is as smooth as with current-tech tires, and maybe they even give better traction as long as the wheels & road surface stay in phase. Better road-holding, fewer traffic fatalities. That would be something new, right? Would it be silly to point out the shortcomings of square wheels?

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