As far as risk...wouldn't confiscation of stolen HPS bulbs by any means prompt authorities to question whether they're linked to a grow operation, most likely illegal? Sounds like enough for probable cause and a warrant if you ask me.

And no, despite my handle, I'm not a narc.

As far as HPS for entire grow, mine grew taller with HPS, but bushier with a MH conversion bulb, both at about the same rate. HPS, slightly faster results.