If you look carefully at the on/off switch you'll notice a white line that points to the on/off markings on the body of the light. If the light is off turn the on/off switch one more position counterclockwise so the white line lines up with what looks like two arrows pointing in opposite directions (shown in one of your pictures). If you've done that you know the light will now come apart. You might want to consider replacing the bulb with an LED to reduce heat.
I don't know if there are any loose parts inside so be careful nothing falls out and gets lost.
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