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DLP6500FLQ: Difference between dlp6500flq and dlp6500fye

Part Number: DLP6500FLQ
Other Parts Discussed in Thread: DLP6500FYE

Please watch this:

Type A DMD Chip (dlp6500flq):                
robust, highest performance housing (golden)
specified for 400-700nm
exact positioning possible by frame fittings
 
Type s600 DMD Chip (dlp6500fye):
cheaper housing
specified just for 420-700nm

Can you tell me the meaning of  "exact positioning possible by frame fittings"?