The website says "regulating" not "protecting". But at which level? :dunno: Cameras have recommended storage conditions, around 45% RH (+/- 5%).
Have you ever done a BBQ and filled up the charcoal? You'll know what a dirty job this is (literally). Is this something you want to bring close to your camera? Your choice. Most people here use dry cabinets and some use dry boxes with Silica Gel.
Charcoal are known to absorb odour and moisture, but since there is a dry cabinet specially design to use for our precious camera and lenses. I don't see any benefits of using other alternative methods.
Bro...the lightube dehumidifier is designed to put in the wardrobe so the clothes don't smell. It works by gently heating the air and warm air will circulate and "remove" the moisture. Not recommended.
As a fellow Bro...I would advise you to buy activated charcoal. It is specially manufactured to absorb odour. It does not disintegrate into powder and hence won't contaminate your camera stuff. It comes packaged in a fine filter cloth and won't puke dust all over. Available at Home-Fix DIY for about $3.50 a pack and can last a few months.
Don't use ordinary charcoal or you will be asking for trouble later on.