Havent worked out how to drive a cft-90 yet so thought i would mod my 145mm aspheric to use k75 as light engine. microwave dish sized spot on a mobile phone tower at just under 1km away.
Edit: i did some measurements and got 5.2km throw but there is no way it could be that
I’m confused grin, you say 145mm aspheric but the photo shows the lens not much larger than your K75, am I missing something or forgetting how big the K75 is?
Lux times distance squared, probably need a 20M or 50M lux test to really get a good read on it. That would be candela, multiply that by 4, then take the square root of the answer for throw.
So, like on my last 5M reading (25 multiplier as 5x5=25) I got 45200 on the meter, for 1.13Mcd. X 4 = 4520000. The square root of 4,520,000 is 2126 so that light throws 2126M or 2.126km
(CFT-90 in a 95mm reflector driven at 22.4A from an FET driver off an 32650 at around 4600 lumens. I’ve since had it show 5010 lumens from a Samsung 30T but didn’t retest lux)
The k75 is a big light here it is with the lens out of the housing has a few scratches. But now i have the dimensions i plan on buying some big billets of aluminium and a new lens so i can get it looking better.
Thanks for bit a clearer explaniation I will eventually get it right. My disto showed a service message when tried to measure the distance more accurately. Might be cheaper to buy a new one. So i will have to wait.
I have a 178mm lens for the next one which will be shoulder held that is what I want the cft-90 for, it will go well with the 8x6w laser diodes i have for it. already spent over 2k on parts for it.
Arh i just looked them up 200mm is $100 cheaper than i paid for the 178mm. Only problem with that is 200mm will need a bigger billet unless i do a lost wax casting to use the pile of swarf i have.
thinking of using thermoelectric cooling or endermans method of liquid cooling will make it easier to mount the focus drive motor. The liquid tubes can run from the back of the light through a carry handle into the black driving light housing where a copper coil will be. Cctv camera with PTZ module to act as range finder and control focus drive motor and will allow for remote operation.
Here is a bit of a layout of the host.
installed shaved LH351d, thanks to moderator007 and installed Kaidomain reflector, also thanks to moderator007
added Nyogel 767a to smooth out the ring control
the LH351d is 34% brighter (545 lumens on IMR 18350), than the sw45k (408 lumens on IMR 18350)…
LH351d is greener due to the Slider Effect (I compare everything to N219b sw45k…) lol
clemence wrote:
“This is the JonSlider effect (he popularize the phenomenon). Even my camera agrees.”
LED to 219b 4500k sw45k
reflector to kaidomain
control ring to Nyogel 767a
proof of light
the reason the beam is not not pink, is the photo is taken late at night under incandescent, so the sw45k looks cool blue… the Pink will be back tomorrow, when the sun is shining again
Yesterday I modified one of my Nitenumen NE01 to be able to use it in cave excursions (in Rome there are several caves under the surface)
I replaced the parabola with a 120° TIR, then I added some rubber, against small bumps, obtained from an old and too cheap binoculars. In the excursions the strap will disappear
Nice looking modding job jon_slider .
I really like your comparison pics also, way better than I can do.
Now you got to try the sliced 3500k contactcr offered or a sliced 4000k that I’ll offer to send your way.
. @contactcr
You wouldn’t happen to have a comparison shot of the sliced 3500k would you. I might like to try one myself.