thesk8nmidget said:these are $50 (fifty)
and the phr sleds have tiny cubes
the ones at optotronics are broadband coated these will result in a lose in power.
these cubes are ar coated for 405nm which will minimize the loss quite a bit!
So what is the difference? out of a 100mW blu-ray? between the broadband coated and the 405nm coated?