Unilite PS HDL2 Helmet Mountable Head Torch 990 430 591 performance and noise specs whilst performance and noise specs whilst also offering a drop in replacement for anyone wishing to replace their old unit The optional additional heater (400W) can be used pre or post the heat recovery unit (a pre heater must be used if Passive House conformance for the heat recovery unit is required) They are used to temper incoming supply air through the heat recovery unit 45° rotational head for flexible lighting angles and you can choose between the fully adjustable headband or the included 3M helmet mount pad for personalised use