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The 4m International Liquid Mirror Telescope (ILMT) is a zenith-pointingoptical observing facility at ARIES Devasthal observatory (Uttarakhand, India).The first light preparatory activities of the ILMT were accomplished in April2022 followed by on-sky tests that were carried out at the beginning of May2022. This telescope will perform a multi-band optical (SDSS $g'$, $r'$ and$i'$) imaging of a narrow strip (~$22'$) of sky utilizing the time-delayedintegration technique. Single-scan ILMT images have an integration time of 102sec and consecutive-night images can be co-added to further improve thesignal-to-noise ratio. An image subtraction technique will also be applied tothe nightly recorded observations in order to detect transients, objectsexhibiting variations in flux or position. Presently, the facility is in thecommissioning phase and regular operation will commence in October 2022, afterthe monsoon. This paper presents a discussion of the main preparationactivities before first light, along with preliminary results obtained.

First light preparations of the 4m ILMT