</span><table border='0' align='center' width='95%' cellpadding='3' cellspacing='1'><tr><td>QUOTE (tschmid @ May 8 2003, 12:00 AM)</td></tr><tr><td id='QUOTE'> I have done some experiments with a 390nm bandpass filter and it worked well. </td></tr></table><span class='postcolor'>
Any idea of the amount of attenuation at 390nm?