Calculation of number of fluorescent Lamps or incandescent lamps in a Sub Circuit?

By Bharat Ribadiya -
Calculation of number of incandescent lamps required in a sub-circuit

In this article you will learn about the calculation of number of lamps required in a sub-circuit. If the current ratings is decided and according to the rating cable installation is complete in final sub-circuit and now  you want calculate the how many incandescent lamps can be use, then use this simple formula.

Let me suppose that for a normal lighting wiring in the office or home; the current ratings of final sub-circuit  or sub-circuit is 5A and voltage is 220V, then how many 100 Watts incandescent lamps can be install. We can find the number of lamps  by using this formula.

So, you can use 100W 10 or 11 lamps having rating of 5A,220V sub-circuit.

Calculate the Number of Fluorescent Lamps in a Sub Circuit

In the fluorescent lamp chock are use to start the lamp and chock work as a controller due to this the number of incandescent lamps is not equal to the fluorescent lamps for same power. Suppose you have to install 75W fluorescent lamp having rating of 5A & 220V supply voltage then by using this formula you can easily find out.


You can use seven 75W fluorescent lamps having rating of 5A, 220V sub-circuit.

In case you want to use both incandescent and fluorescent lamps in the sub- circuit, that time you can find out by using this formula.

Supply voltage X Current rating of the sub-circuit
⎼⎼⎼⎼⎼⎼⎼⎼⎼⎼⎼⎼⎼⎼⎼⎼⎼⎼⎼⎼⎼⎼⎼⎼⎼⎼⎼⎼⎼⎼⎼⎼⎼⎼⎼⎼⎼⎼⎼⎼⎼⎼⎼⎼⎼⎼⎼⎼
(2 * Power of fluorescent lamps ) + Power of incandescent lamps

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