I have used sukam and luminous both invertors and batteries.So on the basis of comparison and usage I will recommend luminous as good invertor and one can buy it with better quality and better customer satisfaction.My sukam invertor stop working once warranty was over and even batteries were not so good.But luminous invertor is working since last 5 year and battery life also works for around 4 year and 7 month.I always take care of battery by using battery water twice in a year as power was very bad in my area earlier.So experience with luminous is satisfactory.If you keep maintain your battery well then also battery life always better.But this was not in case of Sukam.So giving full marks to luminous wit