Science Fair Project:

Color Rendering Index: The Best Lighting for Makeup

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Materials

  • Warm light bulb
  • Cool light bulb
  • Full spectrum light bulb
  • Lamp
  • Lipstick
  • Eye shadow
  • Eyeliner
  • Piece of white paper
  • Pencil
  • Notebook

Procedure

  1. Take out a sheet of white paper. This is your makeup palette. Make a streak of each of the different kinds of makeup on the white paper. Take a close look at your streaks under natural sunlight. What colors are they? Make a note of this in your notebook.
  2. Go to a completely dark room. You’ll try out each of the light bulbs in turn. Set up a lamp on a table and place the warm light bulb into the lamp. Turn on the lamp and observe the makeup streaks. Do they look different? Note any differences in your notebook.
  3. Now put in the cool light bulb. Turn on the lamp and observe the makeup streaks. Do they look different? Note any differences in your notebook.
  4. Finally, put in the full spectrum bulb. Turn on the lamp and observe the makeup streaks. How do they look now?
  5. What light bulb made the colors look similar to sunlight? Which one made them look different?

Results

The light from the full spectrum bulb is most similar to sunlight and is the best lighting for makeup.

Why?

Color isn’t as stable as we sometimes assume it is: it’s really quite complicated! Color works like this: if you’re standing outside in the sunlight, you’re surrounded by all of the different colors of visible light, because sunlight contains all of the colors of the rainbow. When it bounces onto an object, the surface of that object absorbs all of the rays of light except for its particular color, which bounces off and hits your eyes. For example, a red apple absorbs all of the light except red, which it reflects back to you. Your eyes see that reflected light, and your brain thinks, “Aha! A red apple!”

Colors appear to change under different light sources because not all light bulbs emit light like the sun’s light. The Color Rendering Index (CRI) is a way to show a light bulb’s ability to show color in objects, and bulbs that score 90 to 100 on the CRI are best at showing colors in the same way that sunlight would.

Lights also have different color temperatures. Lights that have color temperatures of 5000 Kelvin (K) or more are similar to sunlight. Cool bulbs have color temperatures of just over 4000 K. Lights that are considered “warm” light have low color temperatures around 3000 K. A candle flame produces a very “warm” light that’s just under 2000 K. Warmer temperatures create tones that are yellow and red, while higher color temperatures show tones that are blue.

Here are a couple examples: When you’re sitting by a wood fire, the fire shows warm colors like red and yellow. Now, think about the last time you saw a flame on the stovetop. Part of the flame was probably blue! If you had a fire that was as hot as the sun, it would glow white-hot and would radiate all of the colors of the light spectrum (including light that we can’t even see, like ultraviolet light). Thankfully, we don’t need to bring the sun inside, because a full spectrum light bulb mimics this property of the sun without producing such intense heat.

Now try extending your experiment to test other objects. What does white look like in the different color temperatures? What does black look like?

Author: Tricia Edgar
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