I would think that lighter helmets are better and safer. A lighter helmet means less mass to be thrown about by the forces involved in a crash, therefore the rider is less likely to suffer neck damage. Also a lighter helmet is going to be more comfortable and less tiring to wear during vigorous riding for the same reasons, this would be most noticeable during off road riding on rough terrain.
But ...
Light because it's cheap and nasty = not good
Light because it's good quality and made from carbon/kevlar = good
As always buy the best you can afford, and if you can't afford a good one, save some more then buy a good one.
The views expressed above may not match yours - But that's the reason my Dad went to war - wasn't it?
Life's journey is not to arrive at the grave safely in a well preserved body, .... but rather to skid in sideways, totally worn out,... shouting "man, what a ride"!!!
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