Change flashlight "modes"?

[Scotsman1886]

I picked up an UltraFire with a pressure switch to try on my rifle. It is the model with the multi function light.
Is there a way to change it so it only turns on "bright" and doesnt cycle through all the modes with each press of the switch?

 

[jabe1]

There are many Ultrafire lights which are multi-mode. It will help if you can be very specific as to the model.
My guess is that you have a light which is a P60 host, in which case you can replace the LED drop-in with another that is single mode.
does the head of the light unscrew? If so, is the LED drop- in removeable?