Help me buy an inverter and battery for a 2bhk in Bengaluru

Even on the UPS mode (bought Luminous eco volt neo 1550 as per your suggestion ), the regular tube lights flicker just a bit. Enough to capture in the video footage. Not sure how to fix it.
I know that can happen when you put a sudden load or are near the inverters limit..

For eg issuing a print command to your laser printer.. which can draw as high as 700-1000 watts immediately.

If the flickering only happens at the time of switcher over and appliances are not shutting off.. i dont think you should give it much thought.

That happens even with bigger inverters.. my 2.5KVA does a flicker at the time of switcher sometimes aswell.
 
I know that can happen when you put a sudden load or are near the inverters limit..

For eg issuing a print command to your laser printer.. which can draw as high as 700-1000 watts immediately.

If the flickering only happens at the time of switcher over and appliances are not shutting off.. i dont think you should give it much thought.

That happens even with bigger inverters.. my 2.5KVA does a flicker at the time of switcher sometimes aswell.
What do you think if I put that Godox light on an APC/Cyber power UPS, which has switchover time under 5ms, would it help?