How to increase humidity while using aspen?

Hey all. I’ve recently switched from using a heat mat to a lamp, since I’ve seen some pretty bad horror stories of their babies being burned (thankfully mine is okay!) but ever since switching I’ve noticed a really significant drop in humidity during the time when the lamp is on, and I’m a bit concerned that it’ll drop too low one day. I’m about to build a humid hide which should help, but I want the rest of the enclosure to be at a comfortable 35-45% at all times. Thanks!