Have to agree with Garageboy. In regards of being certified or not, if you're tasked with working in Class 1 Div. 1 you should be using only what they issue or approve.
It's expensive to get certified for 1-1, especially all groups. That being said, my silly little Pelican L1 - 4 LR44 button cell is rated Class 1 - Div 1 grp ABCD...go figure. Although it does make a good map light.
I don't think you'll find too many light manufacturers getting their lights certified unless the're after military, industrial, or Gov't contracts. In which case, they probably were making one task specific and we're just gravy purchases.