How to solve the deviation of rated power of radiant tube

How to solve the deviation of rated power of radiant tube
 
How to solve the deviation of rated power of radiant tube? Is there a good way? This is a problem we often encounter. Radiation tube because in the production process, the length of the alloy wire will affect the resistance of the alloy wire, which will affect the power of the radiation tube, the power error of the radiation tube exists, but the power of the radiation tube according to the JB/T 2379-93 industrial radiation tube standard, the deviation range of the rated power is as follows:
So here's a solution, basically two of them.  Under full heating conditions, the deviation of the rated power of the radiant tube shall not exceed the range specified below:
1. if the radiation tube rated power is less than or equal to 100W radiation tube: ±10%;
2.For radiant tubes with rated power greater than 100W: +5%~-10% or 10W, whichever is higher