I work at Lowe's and we just did our inventory. As a result we got to clearance out all kinds of fixtures and I got a set of Portfolio track lights. (regular $88.00 marked down to $8.80!!!) Anyway they take a type of lamp I have never seen in my life! It's a par 36 lamp (par 36+c lamp code GU 111 GU 10 120v 75w.) It's similar to a 4515 but with a more refined reflector (like a Source Four or SL reflector and a diffuser instead of a dish in front of the lamp capsule). It's manufactured by "Lucky Walter", whoever they are. Where could I buy these replacements should I need them and how much are they? I've included some pic's because they're pretty interesting.