The green filter is simply plugged into the lamp head. The green light is to produce a weak, uniform light and thus given the night vision.
It is a useful accessory for outdoor activities such as campfires, night walks or in a tent.
Compatibility: Lupine Piko to 1200 lumens
Delivery: 1x green filter for Lupine Piko without lamp head
Note: Does not fit Piko models with 1500 Lumens!