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Replacement Bulb for Ultrafire WF-500 Flashlight
(cdn.tcb13.com)
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My opinion: look for a new LED flashlight. It will have the proper circuit and design to take advantage of LED capabilities including high brightness, PWM dimming, power efficiency, and heat management. Adapting an incandescent flashlight will always be a compromise in one of those.
Edit: I have a similar flashlight and I bought a tiny usb-c rechargeable flashlight that is brighter for 1/5 of the size. And for battery life, you can recharge your keychain size light with any usb battery pack.
Yes, feature and price wise that would be the best decision... but I kinda feed bad trashing a perfectly good machined aluminum piece just because of a bulb. :(