Depends when (do I have enough money) and to whom.
I’ve donated all my adult life, for me it’s a way to contribute back, to support, or just to say thank you. But I must also say that in the last decade or so I’ve started donating less to some of them, and have also completely ended my support to a few. Why? Because many charities have started too hard to push their political/ethical/moral agenda.
Among those I constantly support: the French Red Cross and Doctors Without Borders, local food banks too. I will give them money for as long as I’m able to. Like I do to a few other local charities too. I’ve also started donating to my local catholic church (if anyone is wondering, I’m not a catholic I don’t even believe in god) because I think they’re doing real cool stuff to help people that need help and they do it without forcing them to adopt their faith, or whatever.
Wikipedia too, just not yearly. I donated the kind of money I used to spend on print encyclopedia before Wikipedia was a thing just not yearly exactly like I used to not buy a new encyclopedia every year ;)
I also donate to Free/Libre Software projects and devs too (I don’t care much open source itself, it’s the promised freedom that seduced me as a user) provided they don’t ask to adhere to some sort of moral code of conduct in order to use their app or code or whatever. I know this is unpopular stance and that’s fine with me. To make it clear: it doesn’t matter if I agree (or not) with those moral values they’re promoting. My issue is that I think freedom (of usage) is about freedom (of usage) and it should not be freedom (of usage) as long as the dev is ok with what one is using it for, or who one is, or what one thinks, or what one likes. So, if that’s what they’re promoting I won’t oppose it but I certainly will not be supporting it.
We use desk and reading lamps, most being 24w LED a few 12. We don’t use much ambient light… beside the sun, coming by the windows ;)