Glow Plugs - Hot and hotter?

[JoshMB]

I have another thread going on trying to start my 81 300D, but I have a side issue. I am going to replace all my glow plugs - the new kind - but have heard the term "hotter plugs" bandied around. When we say hotter, are we talking about the difference between the old "loop style" and the new "copper shaft style" or are there even hotter styles of new plugs?

Is there a unit of measure in the glowplugs?

Thanks.
Josh

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81 300D 250K+ (odo doesn't work!)
Want another one.