The watertight unit uses six LEDs to produce three different types of light at multiple power levels.  Here itison a PASGT (Personnel Armor System Ground Troops) Helmet

SIts on the helmet to the  side and stays out of the way until needed, or  can be removed  when not in  use

On another style of helmet, the MICH (Modular Integrated Communications Combat Helmet), it seems to work  fine on multiple helmet types. There is even an additional attachment  for mounting on web gear

Uses three 5mm white-light and  two 5mm blue-light LEDs each with low, medium, and high output levels

There are  two  style of the  same unit. The first ones had no disable switch on the  battery compartment, and the new style adds covers to protect the switches which turned on easily with the first design

While very  close to the  newer models, you can see how with no  protection, the older model could be  easily turned on accidentally

To stop the old one from accidentally turning on in use   or  in storage, the best  bet is to remove the  battery

 

The newer version has the disable switch  in the end cap which can be used with  gloves

The  top switch is three position, up is the three white LEDs, the lower position of the top switch is the two blue  LEDs. The bottom switch is the IR blinker. Although small, and now behind a bump guard, these switches are  still easy to find and use with gloves

Used a few styles of  glove to  test the switches, the switches were easy to  locate with the guards, then   simple to  manipulate even with heavy leather gloves

The switches are sturdy and rubber coated to  maintain a watertight  unit

The button  on the outside  of the main unit is the brightness  switch, when either the  white or blue LEDs are turned on, the button toggles between high, medium  and  low  power levels.

 

Blue LED - low setting

Blue LED - medium setting

Blue LED - high setting

White LED - low setting

White LED - medium setting

White LED - high setting

The light can be removed  from it's bracket so  removing the light  from the helmet for safe  storage  during the day, or swapping  out  lights is easy, just push the release button and  move the light forward

The bracket is attached with three  screws

The heavy duty clamp attaches  to the helmet securely and the light  slides onto the bracket  and locks   in  place for use