You actually can. In the control center, you press and hold the flashlight icon to bring up a slider. I discovered it on iOS 12 though, so you might not be able to do it on older iPhones.
Be easy to do by just using an LED bulb, but why would you need a dimmer flashlight, in what situation will you ever stop and say "dangit my flashlight is too bright?"
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Holy shit do you have to let everyone you know everywhere you go that you're a Redditor? It's not that I didn't get the joke it just wasn't very funny. You need to go back
Oh no I’m sorry does my meme not follow your criteria of funny? This is a meme, not a tweet. I didn’t ask for a conversation, I asked for people to laugh, and clearly you didn’t, so stop commenting and comment on a meme you actually think is funny.