difference in Phoenix bulbs

I'm looking at using the Phoenix 14k 250 watt DE bulbs, but I saw the Phoenix Hexarc bulb. Whats the difference in the two and are they worth almost twice the cost? Anyone using the hexarcs, if you could give a color description comparing them to Radiums. thanks
 
they may be the same bulb, not shure but i just got my first phonex bulb, the box says hexarc blue 14000k metal halide bulb and on the end of the box it says mh 250W/DE, i have only used hamilton 14k bulbs untill now but i'm liking the phonex, it seems much whiter/less yello than the hamilton, it's only 2 days old and i've heard they get a little bluer with time.
 
all phoenix bulbs come in boxes marked hexarc so you are seeing the same bulb at different price points.
 
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