Startup Idea: LED Resistor Calculator App Development Idea

Startup idea to develop a mobile app to simplify the calculation of necessary resistors in LED lighting projects. The app would take power supply voltage and bulb voltage as inputs, then automatically determine the correct resistor required. Ideal for custom LED lighting creators and hardware enthusiasts.

I build custom computers which include led lighting and I do other forms of custom led lighting. The main problem I see that I think would be easy to make a program for is the resistors needed to do a custom led. Basically you have to figure out what type of voltage you have from your power supply and then what type of voltage the bulbs your using needs. Then you do a formula and figure out which resistors to add in. What would be nice is some sort of calculator program that takes the math out of it so people like me would not be constantly trying to figure it out. A big plus would be if you could make it an android or apple app. I would be will to pay a small amount for the program and I think it would make decent money on an app store.