So I need to buy a new flashlight for work. I have researched several different flashlights and found that some only give you the light measurement in Candlepower and some only in Lumens. I'm looking for the brightest possible light. I've tried the conversion math from candlepower to lumens but it just doesn't seem right. So if a flashlight gives off 75,000 Candlepower and another flashlight gives off 742 Lumes, which one is brighter?

There is no comparison between the two.

Candlepower is a measurement of beam of light, and lumens is total output of light.

Sometimes due to design of reflector, or lack thereof.

If possible compare the two in the dark. You should see the difference, if they truly are as I mentioned.

Go for the highest in either that you can afford.

Since candlepower is a beam, it should be designed to have a powerful beam of light.

One with lumens should be more for general lighting for an area.

Which is your situation?

However, often a manufacturer only does one test. Photometric study of lighting is costly, so only one or the other is done.