I got a melting spot in the same spot on my 150 watt double ended bulb. However it didnt really affect the bulbs intensity. I wasnt suprised about my bulb since its a chinese bulb that cost me $15. Im surprised a brand name bulb would do it though especially since it probably cost 4 times as much. Anyway mine is still working fine 3 months later with the melted spot too. I also noticed on one of my power compact bulbs I have on a nano the same thing happened where the two curved parts melted together. So maybe this is a normal occurence not sure though.
One wierd thing though on my MH I also broke the end in the same spot as you did on the bulb that melted just like yours. Maybe that has something to do with it.
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