A FET like the IRF540N can do the job. But to be sure you need to raise the 
gs voltage to about 7 Volts instead of the max 5 directly from the PIC.
And be aware of the fact that the current with a low filament temperature is 
much higher than when the lamp is already heat enough.

----- Original Message ----- 
From: "Josh Koffman" <joshybear@gmail.com>
To: "Microcontroller discussion list - Public." <piclist@mit.edu>
Sent: Thursday, November 05, 2009 1:55 AM
Subject: [EE] 24V Dimmer


> Hi all. I might be called on to help out with a project. The part I'm
> most unsure about is that the intensity of a 24V 250W light bulb will
> need to be controlled, preferably by a PIC. It's being supplied by a
> 24V battery.
>

-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist