grins projector, recoil and test light builds

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grin
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Just 2 × 145mm fl370mm aliexpress lens. I find a single lens doesnt work as well as 2. It did attract attention last night because of the projection onto the clouds

Enderman
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Ah yeah, I think I remember something about multiple spherical lenses vs single aspherical lens having a similar effect on collimation.
That’s prett cool.

grin
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I have done a lot of reading and looking to find more information on what im doing and they are pretty much elipsodial reflector spot light without the reflector. There is a thread way way back here
Some lights use a double convex lens this could explain the lens configuration in the W30. It will be interesting to see what these W50 lens is.

grin
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Well um I scored these today are they a matching pair?





And a bonus

Couldnt believe it.

Enderman
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Nice.
They def need a recoating though…

grin
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At a guess the damage may have come from an exploding globe. Looks like it has had molten glass sprayed on them. Monday I will inquire about getting them resilvered there is a place that restores antique mirrors. I will see if the bloke who gave them to me and probably get a few of his restored aswell.

kennybobby
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Do you know how these were used—was it related to flash photography or stage lights? Curious flat section, what’s that about?

Type # 12 – 4¼ – 25

Here’s my guesses:

12” diameter 4¼ depth or sag of the lens
25 focal length or radius of curvature

Now i used to think that i was cool,
drivin' around on fossil fuel,
until i saw what i was doin',
was drivin' down the road to ruin. --JT

grin
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Im not exactly sure but I think you are close. By the markings and being of high quality I wouldmthink military lights of some sort. The bloke who gave them to me brought them from a bloke on stalkbook who just found them in the back of his shed.
There was another two like them and they were aluminium. Thats why I think maybe they were in the same light. For temporary landing lights or something. The date on most of them was 1940s but it is very hard to find information on them. Only problem is the more you look the more bargains you find.
This is one that I sold. Looks like a ceramic backing


This is the 250mm I kept and hopefully to be restored






grin
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Modified W30 next to a maxabeam.

Lothar
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Hey grin, which is which? And what did you modify on the W30? Did you take before and after measurements?
Thanks

Current Collection:

BLF: BLF-GT90, BLF-GT70 (CW Sliced), BLF GTmini, BLF-LT1; 

BTU: Shocker (3 x SST-40 @ 8A)

Solarforce: L2P (XM-L2 U3 @ 4A), MPP-1 (XP-L HI @ 6A), MPP-3 (3 x XM-L2 U2 @ 12A), M6 (Nichia 319A @ 6A), M8 (XHP-50.2 @ 9A), 9x (9 x XM-L2 U2 @ 2A)

Coming Soon: Lumintop: BLF-GT4; 

grin
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Maxabeam is on the left. W30 is same cut one mentioned earlier. i made an adaptor to go in my lens jig. The configuration used primary lens 200mmD 400mmFL, secondary lens 150mmD 200mmFL. No measurements yet but I am working on a setup to take accurate measurements. Another W30 ordered for a lightstorm s90 clone so before I mod it I will take measurements for comparison.

grin
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What could be better than a searchlight mirror?

kennybobby
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Two searchlight mirrors.

Is it a newer version?

Now i used to think that i was cool,
drivin' around on fossil fuel,
until i saw what i was doin',
was drivin' down the road to ruin. --JT

grin
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Exactly the same numbers the condition is not as good. This one came from a government research place in sydney the old bloke said it was originally in the searchlight but they were long gone. They must have been a standard light brought in during the second world war. It will be interesting to see if anymore turn up.

grin
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Well I have taken a different approach to designing lens lights and now before I try to build it out of alloy this way will give me exact measurements. So i have been playing with W30s and some new lens, i have this combination which was a calculated guess. It is a 75mmx75mmfl condensor and 150mmx600mmfl primary or objective lens. the actual length is still too long for a torch so I need to experiment to shorten it. My apologies for not having measurements but very soon when Im confident they are accurate enough to use.




From my measurements the stock W30 runs at 2.6amp the driver in this W30 runs at 3amp with resistor swap from R025 to R010. my tests point to the laser diode being able to handle 3.5amp and you would be stupid to take my word for it. Does anyone know if W30 has a linear driver?

grin
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Was doing overtime tonight and I had K30GT and a MF01S on me so took some beam shots from the boiler. The crane is about 200-300m

K30GT

MF01s

MRsDNF
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Just catching up on your thread grin. You have been busy. Love your work. Beer Love

 

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

                      "My man mousehole needs one too"

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.

 

G0OSE
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MRsDNF wrote:
Just catching up on your thread grin. You have been busy. Love your work. Beer Love

Same as!
grin
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Thanks and Beer

Well I have worked my way through this puzzle and I think I have my head around it. Mostly Big Smile
Now I understand more what im going on about. I have struck to using spherical lens because they are off the shelf and to get around aberration problems Im using multiple lens. I think using an objective/primary lens with a focal length of at least twice the diameter reduces the aberration to near zero and gives you that clean crisp bright laser like beam.
The_Driver was absolutely correct a very short focal length precollimator/condensor/secondary lens should be as close to the led as possible. I think the best lens is square, diameter is equal to focal length. It has to big enough to allow some travel and still catch all the light from the led.

This is 5mm movement in the secondary lens and the beam looks thats bright.

If I shorten the focal length the beam quality drops dramatically. It is not just the focal length but I dont fully understand what is happening yet.


CNCman
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Oh my, Shocked , Please don’t catch that tree on fire !

grin
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CNCman wrote:
Oh my, Shocked , Please don’t catch that tree on fire !

It actually lookes that bright and I can push the laser a bit more since I have tested the other one. I am fairly certain the phosphor would handle a 6w diode.

MRsDNF
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Love

 

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

                      "My man mousehole needs one too"

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.

 

likevvii
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I recommend you pick up one of these:
http://www.miniware.com.cn/product/mdp-xp-digital-power-supply-set/
If cost is a concern, you can just buy the bottom half. It is the bottom half that does the CC/CV control. The top just makes it easier to adjust settings and monitor. These modules are the top purchase of the year for me in terms of productivity boost. They are precise and very powerful for their size.

You need to focus on how many amps you will put into the diode. I assume the diode they are using is NUBM0A. The most powerful would be NUBM44v2 but that is very expensive.
I would aim for 3.8~4.0A into the diode for NUBM0A

Regarding the phosphor, it will actually drop in performance if you push it too hard. You can just use a lux meter while adjusting diode current to find the maximum output. You don’t need to have the output focused. As long as you keep your measurements consistent, a bare phosphor measurement is enough to find out your real life maximum.

In my experience with this type of phosphor (silicone binded YAG:Ce crystal powder) at around 3.5A with a spot size around 0.7 × 0.5mm (really hard to accurately estimate this), it will reach maximum performance. I dont have a W30 myself but I estimate this is the spot size they have. If the focus is any smaller, it will burn the phosphor even at around 1.2A

grin
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I was looking at one of those power supplies so I now wait for one. The W30 spot would be set by the small lens in front of the phosphor the other lens collimates and shapes the laser output. I have NUBM44 diodes, 16 are going in another little project. Thinking I might buy some phosphor crystals enderman linked somewhere.

pinkpanda3310
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Can you pass along a message to the new astronauts. Thanks mate Beer

  

grin
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pinkpanda3310 wrote:
Can you pass along a message to the new astronauts. Thanks mate Beer
They told me to go away, their air conditioner was working overtime or something.
kennybobby
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grin wrote:
… The W30 spot would be set by the small lens in front of the phosphor the other lens collimates and shapes the laser output.


Is this showing the guts of a W30, or what is it? What is the purpose of the prism and side lens—is that for the output beam? is it off-center?

Now i used to think that i was cool,
drivin' around on fossil fuel,
until i saw what i was doin',
was drivin' down the road to ruin. --JT

likevvii
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Thank you for sharing the picture.

How far apart does the small lens sit away from the phosphor?

I finally understand how acebeam can manage 500lumens. I couldn’t understand how 500 lumens was possible because I never knew about the additional lens!

What focal length do you think the small lens is using? I now really should test this.

Have you looked into the nichia nubm31t or nubm41? They are very easy to manage as their beams are so compact.

MRsDNF
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grin wrote:
pinkpanda3310 wrote:
Can you pass along a message to the new astronauts. Thanks mate Beer
They told me to go away, their air conditioner was working overtime or something.
LOL

 

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

                      "My man mousehole needs one too"

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.

 

grin
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kennybobby][quote=grin wrote:

Is this showing the guts of a W30, or what is it? What is the purpose of the prism and side lens—is that for the output beam? is it off-center?

Yes this is the light engine the laser is offset andhas a lens in front, a collimated beam is directed by the 2 prisms back onto the phosphor through the small lens. This small lens is a condensor lens. It sits about 2-3mm above the phosphor, the output has a 120° cone of light. This small lens makes it hard to calculated anything with the W30 engine because when you add an element none of these can be at their focal length because the lens as a whole wont focus. Im not exactly sure if this changes the laser size or it could be aspheric with a window in the centre for the laser to pass through unchanged.
This is a screen shot from an article on thorlabs website that explains most how I work out how far the condensor lens has to sit from the light source to catch all the light and direct it to the next element. Yes there are losses in each element but the overall result is a lot of visual gain. Without the small lens in the w30 it could not do what it does. This also explains why they used a double convex in this case an objective lens. The double convex just projects the image from the small condensor lens
If this is copyright I will delete it.

Just a little to add to this because we are using lens for lighting not imaging everything has to be slightly out of focus. The abberations do play a part but there are work arounds. Because they happen on the outside edges oversizing the condensor so the light only passes through centre is one way of reducing it.

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