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Bar end light mount - drivers eye height , sort of. ... on/off easy and can see if working! made from m/c bar end and dismantled cheapy Chinese bar end mirror. 
I'd agree with most of what's said - except when the lane is dark, a flashing light on the front sends my eyes wonky. So my advice is that being able to quickly switch the light from low to high and from constant to flashing is important.
Another thing I've found helpful is to light myself - wear something bright and have a light shining on my torso (not easy to find a position that doesn't dazzle yourself, but worthwhile as people see you, not a small bright light that could be a car a kilometre away or a bike a few yards away)
Big fan of ankle reflective. They immediate identify you as a cyclist
I also prefer a pulsing front light to a flashing one