You should try something like calling up the company and telling them how much you love their product. They'll probably send you one for free. I called Sperry up once about a pair of topsiders that were so comfortable, I had worn them around the world. I didn't ask for anything, didn't try to rip them off, I just wanted to know where I could get them resoled. They had me send them in, they resoled them for free, shipped them back, and sent me a coupon for a free pair. True story.
So call up the manufacturer of your bulb. Tell them it's a wonderful product but maybe it didn't last as long as you thought it should. I bet you they'd send you a free one, or coupons and you wouldn't have to lie, cheat or steal. It's worth a shot.
Hell, I returned a wallet once with $800 in it. Oh but I was sorely tempted to keep it. That had new bike written all over it. Anyway I got free mexican food at a fancy restaurant for a year for me and my family.
Honesty does have it's rewards. Unless the question asked is, "Is that weed I smell in your car son?"