Just some thoughts (don´t know if they can be applied here).

The most important thing to consider is the planned usage. if you only need it to read a book in the evening, to cook or maybe sort some gear, then a small headlamp is ok.

If you need a lamp which shows you the way in the night and possibly in difficult areas (lovely: wet rocks in the night, or rocks covered with some snow), then you shouldn´t concentrate on the weight too much. Light means security. if you loose the path, you might run into troubles.

My fav. at the moment are: Petzl Tikka XP (very good light, still doen´t weight much) nad my new Petzl Myo RXP. bedie these, I earlier used: Myo XP, Myo 5, Lucidio T60 (worst lamp ever) and some old fashioned lamps in even earlier years.

Becks