When I was 16, my dad bought me a head lamp because I would be out in the back yard well after midnight hunting insects and spiders. To facilitate this, I would run down the batteries on his flashlights. This thing not only saved his flashlights from much use, abuse and batteries, but also allowed me to hunt hands-free.
I still have this head lamp and I've found it supremely convenient for viewing my slugs and snails, even in the daylight. It has also enabled me to see the new ambersnail hatchlings that have emerged! They're tinier than I ever thought possible- ten or more of them could fit on the head of a pin. As if that wasn't surprise enough, while I was changing the substrate in their parents' bin (another story entirely), I found five more clutches! The two adults have definitely been getting it on! Anyway, I managed to get a couple of photographs, even though I wasn't sure that my camera was capable of capturing something so small.