http://www.povray.org/documentation/3.7.0/r3_2.html#r3_2_5_1 does what 
you want.

On 06.05.2019 22:10, tTh wrote:
> Hello
> 
> I'm working on a scene with a lot of light, and rendering
> take a lot of time, even in low quality to place the elements,
> and I thought of a function, equivalent to 'clock' which
> returns the value of the -Q parameter of the command line,
> so I can do :
> 
> #if (quality > 5)
>     light_source { ... }
> #end
> 
> I diged through the documentation and found nothing.
> Is it possible to plan this for a future version?
> Is it easy to go into the source code to try to add
> the function? And where to start?
> 
> tTh.
> 
>

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