- May 15, 2016
Hello, I apologize in advance for the dumb question. So, is the fact that the lens needs to be closer to the diode to capture all the light the reason that more powerful blue diodes with a higher raw divergence have a higher divergence after passing through the lens? According to my calculations, an NDB7875 at 8.0mm (the focal length of an Odicforce G8, as I can't find that spec on DTR's G8), with a divergence of 44°, should have a beam diameter of about 6.15mm in the fast axis, while the lens diameter is 6.5mm, which is really close to cropping the raw output. With a more divergent diode, like the NDB7A75, this should actually happen (correct me if I'm wrong), and you need to move the lens closer to the diode, thus increasing the divergence.