Energy Efficiency
The Power of Lighting Power Density
May 8, 2026
When planning a new building or doing a major remodel, the lighting systems must meet local or state energy code. Primarily this means you are only allowed a certain amount of Lighting Power Density (LPD) — the lighting watts per square foot. Most LPD allowances are based on ASHRE 90.1 computer models for various spaces,
Accent Lighting and Contrast Ratios
May 8, 2026
A quality lighting design in a space is achieved by applying the appropriate type of light and the appropriate quantity of light.The primary types of light used are task, ambient and accent. The quantities used will vary, but the visual effect will result ina balance of light and dark that will meet aesthetic and functional
Case Study: Washington State Department of Services for the Blind
May 8, 2026
Link to Seattle Office of Sustainability, PDF of a case study of an energy efficiency and electrification retrofit About the project Address: 3411 S Alaska St, Seattle, WA 98118 Size: 23,200 sq. ft., two-story building Original Construction: 1962 Projected Energy Savings: Up to 70% annually Projected Direct Emissions Reduction: 72 MT/CO2e annually Projected Utility Cost
NXT Level Training
May 8, 2026
From their website: In the rapidly evolving lighting industry, understanding the latest lighting techniques and technologies can be the difference between you and your competition.
Basic Concepts Used in Calculating Heating and Cooling Requirements
May 8, 2026
8 Factors or Concepts to consider for calculations: HVAC Sizing tools – NEEA Software tool
BetterBuiltNW: The Latest on Ductless Heat Pump Installation Practices in Cold Climates
May 8, 2026
Why use heat pumps Cold Climate definition Installation best practices. Video no longer exists on YouTube
Exterior Networked Lighting Controls and Smart City Futures- Current State of the Art
May 8, 2026
When someone says: “We’re doing Smart Lighting for our city,” you might need a little more information to know just what they are talking about. As with most things, there are many shades of meaning when it comes to controls and how we define “smart.” The table below captures some of the broad categories that
Battery Powered Lighting
May 8, 2026
We are hearing more and more about batteries these days for everything from phones and power tools, to cars and computers. All these things can be powered by rechargeable batteries. Just a few decades ago, none of them could be operated that way. But other than the trusty flashlight, we do not think about batteries
Association of Energy Service Professionals (AESP) Annual Conference Review
May 8, 2026
Attended by John Wilson The Lighting Design Lab (LDL) recently joined colleagues from City Light’s Customer Energy Solutions division to attend AESP’s 30th Annual Conference event in Anaheim, California. LDL was represented by your correspondent who had the privilege of opening for a fabulous panel focusing on the energy use and delivery issues that are driving
US DOE Lighting R&D Conference Recap
May 8, 2026
Attended by Shaun Darragh I recently had the pleasure of attending the US DOE Lighting Research and Development conference in San Diego. For those who may not know, the US DOE has played a pivotal role in speeding LED efficacy improvements, and overall acceptance of the source, in both the commercial and residential markets. DOE
