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.
[quote=kennybobby]
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.
86mm kaidomain reflectors for xhp35hi
Nice job on the cut outs grin.
That reflector array looks amazing!
I’m inspired by this thread! I’m looking at a big, vintage enlarging lens on eBay right now, might be rubbish for making a thrower, but I want to have a go anyway!
Thanks, it is good to see someone get something from my ramblings. I have found an article on light collection and collimation that can explain better than I. https://www.newport.com/t/light-collection-and-systems-throughput
The reflectors are a follow on from my OL competition light. I want to get the process of cutting and finishing the reflectors right before I start the big build. So for this one I made a simple jig to put in the metal cutoff bandsaw.
MRsDNF I was cleaning up at work and they told me to throw a pallet of these in the scrap bin I think they are cutters from a horizontal mill. They are brand new except for the bottom left which I got to make a flail or mace. Anyway before I set my lathe up to try it would they be any good to dress the reflectors? The bandsaw cut isnt perfectly straight.
I’d try and use a fine file or emery on a flat surface. I’ve seen some use an emery wheel on a grinder but dont have one of those. One day. I thought your cuts looked really neat. A lot better than I could have achieved.
I did mill some small reflectors like you have cut and holding them in a vice, even gently they tend to warp.
Saying all that your doing a terrific job. 
The quad has been put on hold since I put the leds and boards on the gas burner and walked outside the boards and leds got burnt 
So at the request of another BLFer I have been adapting the 150mm lens I made before and wasnt going to work on that light to a GT90.
Bummer. I was looking forward to that quad.
That pic of the GT’s is a little deceptive. Never owned a GT but I know what 150mm stormwater pipe looks like. That light is not small 
Quad wont be far off.
The GT with 150mm lens is huge and heavy but surprisingly well balanced. Outside is finished except for polish. It will be a 3 element lens train and I still have one internal carrier to build. I will post internals dimensions and lens when it is focused properly.
O….M……G……
I just love coming in here every week to see what craziness you are cooking up! You never fail to please 
No wonder your username is grin!
Keep it up man! I’m fairly sure soon you’ll be responsible for attracting aliens with these crazy beams 
I second this. I really love what you’re doing.
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And I third this :+1:
Great Job Grin !!
A barrel full of chips, I bet.
Nice!
What are the two lens you used for this?
What was the estimated spacing for both lens in reference to the LED?
There are 3 elements 40mmx40mm FL, 75mmx150mm FL, 150mmx300mm FL. I used 3 elements to get the focal length short enough to focus it properly. The 40mm is as close as possible to the led to collect the light. The 75mm takes this light and shapes it for the 150mm to throw down the paddock. I have made the intermediate lens adjustable to allow for focus without changing the outside dimensions. Some photos wil explain better
Amazing work there Grin. Well done.