Is any one familiar with this company's products? They have a couple of aspheric and multi-element collimnator lenses that look promising for red diodes. I just finished comparing the power output from a LPC-815 diode with both the Aixiz glass and the plastic lenses and both reduced the raw output of the diode to 68% when inserted into the beam. The beam diameter exiting the lens was similar and matched the clear aperture of each lens and so I am assuming they are acting as aperture stops. The divergence in both cases was very good with the glass slightly better ie. 5mm at the lens and 5mm-6mm at 7M and no waist. The beam remained the same diameter over the full length. I'm just concerned with this much power loss. Any suggestions?