The figures below show lamp lumen maintenance factor LLMF in over time k 1000 h and number of light source shifts up to 50000 hours for various light sources

Can you repeat this sentence, but add in punctuation?
The figures below show lamp lumen maintenance factor (LLMF in %) over time (k = 1000 h) and number of light source shifts up to 50,000 hours for various light sources.