Some time ago Tim Chester, of The Crowded House, in the UK, wrote a series of short insightful posts titled: Effective Evangelism. In summary, Chester wrote:
There are three keys to effective evangelism:
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GRACE & PEACE 
Sounds like salt and light to me
Yes, there are certaily similarities. But just as Scripture uses multiple images to illustrate certain things (i.e. church, kingdom, salvation, etc.) so I like this paradigm.