### Are LEDs the Future? Sensor help.

Posted:

**Thu Oct 04, 2018 12:50 pm**Hey forum,

So I've been thinking of doing the a project from ScienceBuddies, but I want to make sure it will all work out before I commit to it.

The project is called "Are LEDs the Future? Energy Savings with LED Lighting." In short, it has you calculate and compare the relative efficiency of LED vs Incandescent light bulbs. It has you use a Light to Voltage Converter, and you measure it with a multi-meter.

To calculate the efficiency, you use a bunch of complicated math equations, that I don't really understand. Could someone explain them to me?

1. Optical output power of LED (watts) ∝ Voltage drop across resistor (volts)

2. Optical output power of LED (watts) =Nlinearfactor × Voltage drop across resistor (volts)

Pout = N × Vres

3. Input Electrical Power (watts) = Current going through the device (amperes) × Voltage across the device (volts)

Pin =Iin × Vin

4. Relative Wall Plug Efficiency (dimensionless) = Optical Output Power/Input Electrical Power

Thanks in advance!

So I've been thinking of doing the a project from ScienceBuddies, but I want to make sure it will all work out before I commit to it.

The project is called "Are LEDs the Future? Energy Savings with LED Lighting." In short, it has you calculate and compare the relative efficiency of LED vs Incandescent light bulbs. It has you use a Light to Voltage Converter, and you measure it with a multi-meter.

To calculate the efficiency, you use a bunch of complicated math equations, that I don't really understand. Could someone explain them to me?

1. Optical output power of LED (watts) ∝ Voltage drop across resistor (volts)

2. Optical output power of LED (watts) =Nlinearfactor × Voltage drop across resistor (volts)

Pout = N × Vres

3. Input Electrical Power (watts) = Current going through the device (amperes) × Voltage across the device (volts)

Pin =Iin × Vin

4. Relative Wall Plug Efficiency (dimensionless) = Optical Output Power/Input Electrical Power

Thanks in advance!