Does the back section of Northlux BR30 bulbs emit light or is it sufficiently coated?

Does the back section of Northlux BR30 emit light or is it sufficiently coated that if in an exposed track head, no light escapes? I want to use it in heads that don't have baffles that would limit the spread of the light. 

We're happy to confirm that the bases of our BR30 bulbs are enclosed in an opaque white plastic shell. As such, no light should be emitted from the base of these products while they are in use.