Just after some opinions on Metal Halide vs Halogen and fluorescent lighting
for outdoor use...

I am after the most energy efficient lamp that is practical to illuminate a
patio area, a 500w halogen does the job well, but is 500w, obviously.

I am not bothered if there is a few minute warm up time, as I won't be using
it for PIR activation, just general use when having a BBQ etc.

My options seem to be, stay with a standard 500w halogen, go for a
fluorescent like this
http://www.qvsdirect.com/Low-Energy-...-pr-22878.html

Or a metal halide unit
like this 70w one
http://www.qvsdirect.com/Floodlight-...-pr-22951.html

or this 150w one
http://www.qvsdirect.com/Floodlight-...-pr-22952.html

What is the average lamp life of these units, and the approximate halogen
equivalent light output?

Thanks!