**I would say yes**. The [usage of "lakh" as a unit is fairly limited][1], to the Indian subcontinent. For the sake of clarity, it makes sense to convert it into a digit grouping system that's widely understood.

Informally, we've had similar discussions in comments in the past about the usage of commas versus dots in digit grouping. I don't think we have a specific stance on this; it's usually dependent on the author but we veer towards using commas instead of dots [since more countries in the world use that system][2]. (Although one could say the most populous countries use the "dot".)


  [1]: https://english.stackexchange.com/a/202806/4866
  [2]: http://en.wikipedia.org/wiki/Decimal_mark#Hindu.E2.80.93Arabic_numeral_system