Canon SPEEDLITE EL-1 Advanced User's Manual page 211

P.Fn-08:
You can set the color and brightness of the modeling lamp.
Use the joystick to select <
setting, then push the joystick vertically.
: Push the joystick to the left or right or turn <
modeling lamp.
: Push the joystick to the left or right or turn <
of the modeling lamp.
Note
You can either push the joystick to the left or right when the modeling lamp is lit, or
turn < > and push the joystick vertically to change the brightness and color
temperature.
P.Fn-09:
You can set the lit time of the modeling lamp.
0: 5 min
1: 30 min
2: Unlimited
(Modeling lamp (brightness, color))
> or <
(1) Selected cursor position
(2) Default indicator
(Modeling lamp (lit time))
211
>. Turn < > to select your desired
> to set the brightness of the
> to set the color temperature