F##KKKK!!!!! Just killed a HL6388. Screwing around with a PBS cube almost ready to combine to make 400+ mw of 638 and must have reflected back thru the prism to the diode and BAM - a $130 LED. And an entire day of work shot. SH*T !!!! It's my own fault. Damn! Gotta be more careful next time. Arrrgh .