Bridgelux SE suffix indicates the series.
For example part numbers:
Part number BXRC-50C10K1-D-74-SE
Vero® SE 29 Array
Part number BXRC-50C10K1-D-74
Gen 7 Vero® 29 Array
You may note similar electrical ratings between the two. Please note the difference in how these modules are terminated.
Reference pg. 4 of each datasheet.