LED internal bulbs for caravans.

My van has 19 internal halogen lamps mounted as down lights. They have the G4 type of bulb, two pins protruding from one end, which push into a corresponding female fitting into the lamp base. They have a 10 Watt output.

I would like convert these to LED , but are not sure what to purchase, as there are many brands out there, at varying prices---- $5.00 to $16.00 ea. Will be a tad expensive if I decide to replace them all at once at the $16.00 mark. May be I will do it gradually, a few at a time.

Also what does the 10 Watt output convert to into either Kelvin or Lumens which is mentioned in the advts. I am not sure what Kelvin or Lumens are exactly , all I want is to have a replacement LED with the same light output.

Is there anyone out there can help me, I don't mind if you are a business member or person or not. All suggestions gratefully received. Regards G.T.