How do you calculate LM

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How would one calculate the LM of a lamp?
I have a sharp xv-C10M that runs a 155w Metal Halide lamp
Original part number: Clmpf0053de05 65v? 155w
Cant find more spec's🙁

Want to replace with LED block but need to know how much LM is the minimum I would need to have a good picture.

All the help would be appreciated a lot🙂
 
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