How to check light state

[Drew]

I want to know if I can code something like this or the correct way to do it:

IF LIGHT5 = OFF THEN MESSAGE MACHINE NOT HOMED

I know I could shadow the light with a varable if this is not possible.
Thanks Drew

[Karl_T]

You'll have to use a variable flag every time you change the light state, then check that variable.
Example

LIGHT4;ON:\104=1
...
...

IF\104=1THEN...