Generally speaking, one advantage of halogen bulbs is that they last very long and therefore are very cost efficient. The brightness in this bulb amounts to 140 lumen.
From OnBuy
OSRAM Halogen-pin-base / HALOSTAR /G4-socket / dimmable /12 Volt/ 10 Watt / warmwhite - 2800K/ Pack of 2
Conrad Electronic
OSRAM HV halogen EEC: G (A - G) G4 33 mm 12 V 10 W Warm white Pin base dimmable 2 pc(s)
Robert Dyas
Osram 10W G4 Eco Halogen Pin Base Light Bulbs - 2 Pack