gav6280
Enlightened
Do you think i would get 4, 21.6mm LXP optics, onto a 34mm quad xpg board, as it doesn't matter if they hang off the edge as its foing in a 52mm housing?
Hmmmm......
Hmmmm......
4 LXP optics on a 4 up XPG board.
- Thread starter gav6280
- Start date
Help Support Candle Power Flashlight Forum
Klem
Enlightened
Unfortunately not.
Looks like the XPGs are mounted mid-way on the board's radius (8.5mm from centre). Your 21mm optics are 10.5mm radius... Too big. They will crowd in the centre.
Looks like the XPGs are mounted mid-way on the board's radius (8.5mm from centre). Your 21mm optics are 10.5mm radius... Too big. They will crowd in the centre.
the diameter of the circle that fits around 4 of these lenses in a square will be
sqrt(diameter²+diameter²)/2+diameter=36.87mm
That is larger than the board, but at least that fits in the 52mm housing. Assuming the leds are positionned halfway the radius of the board, that is not going to fit on the board, since the board would require a 36,87mm diameter to make it fit.
Edit: made a mistake here as pointed out in the next post...
The sqrt shouldn't be divided by 2 to get the diameter, or you should add the radius instead of the diameter to the sqrt/2 to get the radius of the big circle. See post #5 for the correct answer ;-)
I think it is better to use seperate stars with these optics. These multi-emitter boards are usually made to combine with multilens optics.
sqrt(diameter²+diameter²)/2+diameter=36.87mm
That is larger than the board, but at least that fits in the 52mm housing. Assuming the leds are positionned halfway the radius of the board, that is not going to fit on the board, since the board would require a 36,87mm diameter to make it fit.
Edit: made a mistake here as pointed out in the next post...
The sqrt shouldn't be divided by 2 to get the diameter, or you should add the radius instead of the diameter to the sqrt/2 to get the radius of the big circle. See post #5 for the correct answer ;-)
I think it is better to use seperate stars with these optics. These multi-emitter boards are usually made to combine with multilens optics.
Last edited:
I was doing this out of my head and had mixed up a radius with a diameter somewhere...
correct formula should be sqrt(diameter²+diameter²)+diameter=52.15mm
the sqrt gives the distance between the centers of the lenses that are not next to each other. the added diameter adds 2 times the radius of the lens to complete the diameter of the circle around the four lenses.
this would be tight fit in a 52mm housing...
gav6280
Enlightened
Wasnt expecting that, cheers.So the answer is NO.
Plan B)
Im going to buy single xpg's and mount them directly in the housing.
Thanks.
stars are usually 20mm, so that should work and can provide aditional support for the lenses. I have 10mm stars and this makes things more complicated since the lenses aren't wel supported. I'm now looking into putting washers around the star to provide the extra support and to be able to fix them proberly to the heatsink.
