I've heard that some metals are more transparent to RF than others.
ie: titanium and aluminum block less RF energy than steel and brass.
Is there a list or chart that lists the relative transparency of metals to RF?
Plastic is not scratch resistant.
It's more or less a retrofit. The original electronics are being moved to a new shell. 2mm is the distance between the rim of the pill (tube containing the LED, driver, MCU) and the LED's base. And the shorter the distance to the lens, the less light I lose...
12.7mm mounting diameter
a lens mounted exactly 2mm from the PCB
The rest is right.
How thick is too thick? hum. A LISA XP lens adds about 5mm to the front of the LED assembly to produce the beam posted in the picture above. But I don't like it because it's plastic. So I would have to say 3mm...
Thanks for replying IRstuff. But loss of efficiency would be a definite no-no. And the beamshot picture above is taken from a LISA XP lens designed for the XP-E. But I choose not to use it because a single lens would take about 5mm off the overall length.
Thank you all for answering. I have contacted Edmunds and skimmed through the literature provided above. I find that perhaps an aspherical lens is not what I am looking for.
What I want to do is focus the light from a Cree XP-E LED
http://www.cree.com/products/pdf/XLampXP-E.pdf
Through a...
I want to order some aspherical lenses to use with focusing the light output from a single LED. I am not familiar with optics and I would like to know how to calculate the needed specifications so I can order from an optics supplier.
Is there some sort of formula that I can use?
