Why make it more complicated than you have to. I'd forego the gas. There are some great down-lights on an extended arm - you sometimes see them on early 1900's factories or cafes. An oiled bronze, hammered metal version would look awesome here.

Here is the sort of thing I mean: http://www.homedepot.com/p/t/202046893?catalogId=10053&langId=-1&storeId=10051&N=5yc1vZ25ecodZbvniZ1z1164a&R=202046893#.UUSX1zfovrE
There are so many fabulous lighting choices in electrical that I wouldn't go through the trouble of a whole different installation.

I agree with above comment. Why go to the expense of installing gas when there are some beautiful carriage lights out there these days. If you install the gas line you are going to see it and they are not pretty. This entrance looks nice, and upscale-why add an ugly gas line when not necessary ? Yes you do need a lantern that is bigger in scale and I would also consider changing the color to black which will add more impact.

Get larger electric ones.

My husband will love all your comments . . .he thinks I am a kook to switch to gas ;-o

I have used Lantern & Scroll in the past, and we ran copper lines on the wall, instead of inside the wall. Here is a link to the picture, and it looked great and was less expensive. You won't even notice the gas lines because your brick is a very similar color. Good luck!

If you need adequate lighting, I'd stick with electric as they can put out much more light. I would only switch to gas if you have adequate lighting from other sources and want more of an ambient effect.

@mmilos - good point!

@ncdiy can you send link please

No problem, I tried to attach the picture and I guess it didn't. I'll see if it works here.