Nowadays, Energy bills are the concern for very individual due to inflation and increase in rate.
In old days, people were using 36W and 40W tube light fittings and they have experienced a decline in intensity of lights over the time. In that case if you are using single tube light of 40 W for 8 hours average daily then you will be consuming 116.8 Kwh yearly which costs you around 820 rs/annum if you consider 7 rs/unit rate from supplier.
In case of our philips tube light 25W rating is there which will consume 73 kwh yearly and cost around 510 rs/annum.
The best scenario is to use 18 W LED tube lights from syska. 18W will consume only 52 kwh yearly if you use 8 hours average daily and cost you around 360 rs/annum if you have a per unit charge of 7 rs.
Hence, you can prefer Syska 18W LED tube lights for better illumination and savings on bill.