I use something similar to this:
https://www.amazon.co.uk/VOLADOR-Flashlight-Rechargeable-Submersible-Battery/dp/B07RMXK1G3/ref=pd_aw_sbs_60_1/260-9523008-4834333?_encoding=UTF8&pd_rd_i=B07RMXK1G3&pd_rd_r=a72bf2ef-5a19-40f0-a0d0-7565b977452a&pd_rd_w=uysp8&pd_rd_wg=2hvOX&pf_rd_p=0208d703-a674-4413-8899-c3889837d212&pf_rd_r=YS93TBY2S5BA9A5K5QWW&psc=1&refRID=YS93TBY2S5BA9A5K5QWW
. . . but with a bit of thin white polythene bag stretched over the bezel & secured with elastic bands, which spreads the light evenly.
I'm considering buying this, to be used in a similar fashion:
https://www.amazon.co.uk/Diving-Flashlight-Underwater-Submersible-Outdoor/dp/B07G42CY9T/ref=pd_aw_sbs_60_4/260-9523008-4834333?_encoding=UTF8&pd_rd_i=B07G42CY9T&pd_rd_r=a72bf2ef-5a19-40f0-a0d0-7565b977452a&pd_rd_w=uysp8&pd_rd_wg=2hvOX&pf_rd_p=0208d703-a674-4413-8899-c3889837d212&pf_rd_r=YS93TBY2S5BA9A5K5QWW&psc=1&refRID=YS93TBY2S5BA9A5K5QWW
Disclaimer - I'm not very good at photography; others may well give you better answers!