How can you use a light meter to improve energy audits?

1 What is a light meter?

A light meter is a tool that measures the amount of light in a given area, usually in units of lux or foot-candles. It can also measure the color temperature, color rendering index, and flicker of the light sources. A light meter consists of a sensor that detects the light and a display that shows the readings. Some light meters can also store data, connect to a smartphone, or transfer data to a computer.

3 How to choose a light meter for energy audits?

Choosing the best light meter for your energy audits can be a challenge due to the many types and models available in the market. It's important to consider accuracy, features, and compatibility when selecting a light meter. Accuracy indicates how close the readings are to the actual light levels; you want one with a high accuracy rating, preferably within 3% of the true value and a wide measurement range. Features like a large and clear display, user-friendly interface, long battery life, and durable design are important for easy use. The light meter should also measure different aspects of the light quality, such as color temperature, color rendering index, and flicker. Furthermore, compatibility with devices and software is essential; look for one that can connect to your smartphone or computer via Bluetooth, Wi-Fi, or USB. Additionally, make sure it integrates with software or platforms used for energy audits such as Energy Star Portfolio Manager, EnergyCAP, or eQuest.

4 How to use a light meter for energy audits?

Using a light meter for energy audits requires some planning and preparation. Before you start, make sure the light meter is calibrated, charged, and set to the appropriate units and mode. You may also want to check the weather forecast and schedule your audit for a sunny day due to natural light affecting the readings. Once you have done so, map out the areas you want to measure and divide them into zones based on their function, occupancy, and lighting type - such as reception, conference rooms, cubicles, etc. Assign a code or label to each zone for easier identification. Then begin taking readings in each zone - taking multiple readings at different locations and heights within each zone for a representative sample. Additionally, take readings at different times of the day to account for variations in lighting. Record the readings and relevant information such as date, time, zone, location, and lighting type in a log sheet or spreadsheet. You can also use your smartphone or computer to capture and store data. Finally, analyze the data and compare it with recommended standards and benchmarks for different zones using software or platform used for energy audits. Use data to calculate potential energy savings and payback period of implementing lighting improvements or retrofits.

5 Tips and best practices for using a light meter for energy audits

To get the most out of your light meter and your energy audits, there are some tips and best practices to keep in mind. When taking readings, avoid windows, doors, or reflective surfaces as they can skew the results. You can also use curtains, blinds, or shades to block the natural light. Additionally, make sure not to take readings when lights are dimmed, switched off, or controlled by sensors or timers as this can affect accuracy and consistency. Also, don't touch or move the light meter while taking readings as this can cause errors or fluctuations. A tripod, stand, or clamp might be necessary to hold the light meter in place. Lastly, avoid using a light meter that is damaged, dirty, or outdated as it can compromise quality and reliability. Inspecting, cleaning, and updating your light meter regularly is recommended; follow the manufacturer's instructions for maintenance and calibration.

6 Here’s what else to consider

This is a space to share examples, stories, or insights that don’t fit into any of the previous sections. What else would you like to add?