This one has a green base....
We do not test for situations like you are describing.
Yes, a few spare bulbs come in the package.
The packaging indicates 6 sets (900 lights total) which is 3 reels of this products which contain 6 sets.
this item contains 2 x 150L light strings, each string is 37.75' in total length/37.25' lighted length, Home Depot also sell our item# 80246HD (Home Depot SKU: 180636) which is our Pro-Line 150L string set, this would be the 37.75' total length/37.25' lighted length item
I've been buying these sets for several years but I'm done. Often, 1/2 the strand goes out and I've spent hours checking for defects, burned out bulbs, etc. Even for strands new or used just a season.
Community answer below.