Fenix makes a few that are like what you’re looking for, I have two, one has one big button on the back and one on the side, the back button is a simple on off and the side button cycles the power settings, if you hold down on the smaller side button it goes to strobe instantly. The other is basically the same but both buttons are on the back. I only buy flashlights that are set up like this or similar. I need to be able to access strobe instantly and I need to be able to turn it on and off at a low power setting without turning on the fire of a thousand suns to get there.