Common phrases:
* Omukulakhulu omukulu (This is a general phrase for "Happy Birthday" and is widely understood)
* Omukulakhulu omukulu ne shikuku (This adds a bit of extra warmth and translates to "Happy Birthday and good health")
* Omulumusi omukulu (This is another common way to say "Happy Birthday")
More specific phrases:
* Omukulakhulu omukulu, omwene omugendi (This translates to "Happy Birthday, may you have a long life")
* Omukulakhulu omukulu, omwene omugendi, omwene okwisa muno muno (This translates to "Happy Birthday, may you have a long life, may you prosper")
* Omulumusi omukulu, okwisa muno muno (This translates to "Happy Birthday, may you prosper")
Things to consider:
* Regional Variations: Luhya is spoken in a range of dialects, so certain phrases might be more common in one region than another.
* Formal vs. Informal: The formality of the occasion will influence the choice of phrase.
* Age: It's also common to add a greeting specific to the age of the person celebrating their birthday.
It's always best to ask a native speaker of Luhya for the most appropriate phrase for the specific situation.