Scene:
	 "string igi_filename" ["suzanne.igi"]
	 "integer igi_writeinterval" [120]
	 "string ldr_filename" ["suzanne.tga"]
		"integer ldr_writeinterval" [120]

Output:

C:\downloads\LuxRender_v0.1rc4_win32_sse2>luxconsole rc4_testscenes\suzanne\suza
nne.lxs
[Lux 2008-Mar-15 19:57:16 WARNING : 0] Parameter 'L' not used
[Lux 2008-Mar-15 19:58:17 INFO : 0] Writing IGI image to file suzanne.igi
[Lux 2008-Mar-15 19:59:17 INFO : 0] Writing Tonemapped TGA image to file suzanne
.tga
[Lux 2008-Mar-15 19:59:18 INFO : 0] Writing IGI image to file suzanne.igi
 -[1]00:02:38 33960 samples/sec  14.1355 samples/pix