I bought an S2 Ecoclick starter off ebay and it glows orange!! AWESOME??  are ALL philips S2 starters neon?  and why are they using neon instead of argon?

Soem or all of the S10s are / used to be yellowish. Really yellowish, not looking like neon either

The starter inside Philips 70 W HPS internal ignitor (is it the same as S10 ? i dont know) is orange-yellowish