Indeed, the product description had not at first glance, very explicit. The bulb was too big for the lamp that I possess. But it happens and it's not the reason for my disappointment. The exchange could not do. Only a refund was possible (with reference to the company ENGLISH) postage in my care and reimbursement in the following 3 weeks. I considered keeping the bulb cost me much less. And I bought a lamp on a competitor's site that cost me a little more expensive than the bulb I ordered. In conclusion, the Maglite lamps, we can throw them when the bulb is not working !!