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Window-Light Mapping: Finding the Best “Free Energy” Spots in Your Home
Window Light Mapping: Finding the "Free Energy" Spots in Your Home (A Family STEM Project)
Window light mapping is a simple family STEM activity that helps you discover the brightest “free energy” spots in your home. Whether you're growing seedlings, houseplants, or experimenting with phototropism, understanding how sunlight moves through your space turns everyday observation into real science.
Why Map Light?
Plants don’t just need water and soil — they need energy. That energy comes from sunlight. When we learn where light naturally falls in our homes, we’re learning how ecosystems function on a smaller scale.
This project builds understanding of:
- Solar energy
- Daily movement of the sun
- Shadows and angles
- Environmental patterns
- Plant placement for healthy growth
It also helps children connect the dots between our Phototropism experiment and real-world plant care.
How to Map Window Light
What You’ll Need
- Notebook or paper
- Pencil
- Optional: masking tape
- A sunny day
Step-by-Step
- Choose a room with windows.
- At three different times of day (morning, midday, afternoon), observe where sunlight hits.
- Mark those spots on paper — or use small pieces of tape to mark the floor.
- Notice how the light shifts over time.
- Compare which spots get the most consistent light.
After a full day, you’ll have a “light map” of your home.
Turn It Into a Plant Placement Challenge
Once you identify your brightest zones, test plant placement. Move a small plant into a strong light area and observe changes over a week.
You can even combine this with our Bean in a Jar project to see how seedlings respond when placed in different lighting conditions.
Big Thinking for Small Spaces
This project is especially helpful for apartment living or small-space gardening. Instead of guessing where plants might grow best, your family becomes energy detectives.
Want to take that idea even further? Our Mason Jar Hydroponics guide shows how to grow food using minimal space and maximum light efficiency.
For more nature-based investigations and hands-on plant science, explore the Junior Naturalist page.
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