
LED vs. Incandescent Brightness per Watt
Medium
How many watts does an LED bulb need to match a 60-watt incandescent bulb? You set up a lux meter one meter from each bulb and measure the brightness.
You test seven LED bulbs ranging from 1.5 watts to 10.5 watts. Then you compare each reading to the 60-watt incandescent bulb.
The 60-watt incandescent produced 812 lux. A 7.5-watt LED matched it at 785 lux. That means the LED needs roughly one-eighth the power to produce the same brightness.
Hypothesis
The hypothesis is that the LED lamp will require less power to produce the same level of brightness as an incandescent lamp.
Method & Materials
You will wire cables and plugs to the incandescent and LED lamp sockets, measure the brightness of each lamp using a lux meter, and record the measurements in a table.
You will need a 60 watt incandescent light bulb, a socket for the incandescent lamp, LED bulbs of several wattage ratings, a socket for the LED bulb, electric cables, 3-pin plugs, a lux meter, and a ruler.
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See what’s includedResults
The results showed that the 60W incandescent lamp provided the same brightness as a 7.5W LED lamp, proving that LED lamps provide the same brightness at a lower wattage and power consumption compared to the incandescent lamps.
Why do this project?
This science project is interesting because it compares two types of light bulbs and shows how LED lamps can provide the same brightness as an incandescent lamp but with less power.
Also Consider
Variations of this experiment could include comparing a fluorescent light with LED lamps, or comparing the brightness of the LED lamp and incandescent lamp at different distances from the light source.
Full project details
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