So today I found myself with my bong and no lighter so heres what I did, I have a multitool with the magnifying glass on it so I focused the beam and took the hit that way no chemicals whatsoever tasted great, unfortunatley where I live its almost never sunny lol so yeah. Its a bit of a pain in the ass focusing the beam but once you find the sweet spot ohhh yeah . Ps. Sorry bout the spelling/grammar.
When I was young, in elementary school there was a magnifying glass propped up against a water bottle, and the ray was pointing to a stack of paper which burst into flames during class and we had to evacuate but it was super cool
I have taken solar hits many times but it has failed me aswell.. It works great on sunny days during high noon, just make sure to orient the magnifying glass perpendicular with the sun's position. Also it is difficult to light a blunt/joint when its windy. I was able to light a jay fairly easy on a hot day though. It has worked for me as late as 6 PM. One time a few friends and I went on this crazy ass bouldering hike. We took a blunt but forgot the lighter. This black guy from California wasn't used to the mountains so he was sketching hella bad about some of the climbing spots. I had my magnifying glass but there was a slight cloud cover obstructing the solar POWER!!! We ended up having to climb down and get these 2 foot long matches out of the back of my car. Went on 2 good hikes that day and smoked lots o' bluntage.
Lol I love days like that just chillin with your friends walkin wherever , wish I had good weather here.