I mean, a ( DIY) 1 or 3 Watt led as my bike's headlight is allready tremendous!
Also, this reminds me way back to almost 25 years ago!
From an old dia-projector, I built this lighteffect.
A big rotating disc with 6 small rotateable paterns in it at the place where
usely the dia is. The ligtsource was 'only' a 50Watt lamp, not a led!
One patern perticulary, existed out of 12 tiny holes, made with a needletip. In a circle patern only 10mm in diameter. Outside, a bit mist/foggy and that patern went easely over 100meters. From that point, it was like you watched into a tunnel of razorsharp lines passing me by from all around, almost like a laser!
I mean, only a tiny fraction of that 50Watt light source was 'free' outside the lighteffect-box and that allready gaves this effect!
You should be able to do something with those lenses ....
Biggest dia. would be best with a short focus ...
but you do need a compact source .... 10W would be OK , although it's a 1/10th the output of 100W the eye will see it as half the light output and being very small it will be fairly parallel ... only a few Euros each inc delivery
Due of some test, I'm convinced that the idea with multiple Fresnel lenses will work, I'm not gonna put the time labor in it, it's not worth it and got other dedicated hobby. This is completely against my nature!
Tnx, oz93666. I understand less Watt with a dedicated lense-system will do perfect.
Searched around and found 20W led's, light source as small as a green pea, like your 10W one, oz93666.
just found out and realized that a Fresnell lens doesn't have this tipping point.
It means every beam 90deg on the Fresnell lens go trhough focus point.
A spherical lens has this tipping point that they go off and due of that one has invented the A-spherical lens ( correct me wehn I'm wrong ).
With knowing this all, I can easily order some round Fresnell lenses and this wil ease a lot!
( with a specific diameter and focuslength )
I don't quiet see the point of having multiple lenses , it will not help the quality or the parallelness of the light output ....
I know spotlight manufacturers do have multiple lenses ,I think this just means they can cut down on the total mass of the lenses ... they use glass , hot (80C) glass won't sag and bend ....
If they used one glass lens with a short focus it would be fat and heavy , so they have a small fat lens , which changes the angle of the light and then they can use a slim big lens , I think that's it ....
If you keep lens cool you can use one big plastic fresnel , these can have a short focus and never get fat