Operational Budgets: Battery & Node Replacement Frequency
Accurately calculate wireless node lifespan and operational budgets to predict component replacement frequencies in large lighting networks.
10 min read
Calculations
Calculations Articles
27 articles on calculations for professionals in the lighting industry.
Other Topics
Financial Modeling: Per-Fixture vs Per-Pole Control Costs
Analyze precise financial modeling comparing per-fixture versus per-pole lighting control costs over a standard ten-year commercial lifecycle.
9 min read
How to Slash Hardware Costs in Commercial Lighting Specs
Slash hardware costs in commercial lighting specifications by replacing individual smart fixtures with centralized high-density edge controllers.
12 min read
Value Engineering: Reducing Wireless Node Count per Square Foot
Learn advanced value engineering techniques to significantly reduce wireless node counts per square foot and lower commercial lighting bids.
10 min read
Calculating Maximum Fixtures per 0-10V Dimming Channel
Calculate the absolute maximum number of LED fixtures per 0-10V dimming channel while factoring in sink/source limits and voltage drop.
12 min read
Managing Voltage Drop in 16-Channel Analog Dimming Arrays
Effectively manage voltage drop and signal degradation in large 16-channel analog dimming arrays for commercial outdoor lighting.
10 min read
Determining Light Loss Factors for Lumen Maintenance
Engineering method for determining total light loss factor variables, combining lamp lumen depreciation and luminaire dirt depreciation values.
11 min read
Calculating Average Illuminance via Zonal Cavity Method
Step-by-step walkthrough of the zonal cavity method for average illuminance calculations, covering room cavity ratios and coefficient of utilization.
11 min read
Lighting Power Density (LPD): Space-by-Space vs. Building Area Methods
Calculate Lighting Power Density (LPD) for code compliance. Compare space-by-space and building area calculation methods for ASHRAE and IECC energy codes
26 min read
Understanding Uniformity Ratio in Sports and Athletic Lighting
Understand Emin/Eavg vs. Emin/Emax uniformity ratios in sports lighting, required values by sport and class, and how pole placement and optics affect uniformity.
12 min read
Calculating Average Illuminance: Grids, Formulas, and Tolerances
A comprehensive guide to calculating average illuminance. Learn proper grid spacing techniques and statistical tolerances required for code-compliant design.
24 min read
Calculations
Featured
Footcandles vs. Lux: Understanding Lighting Units and How to Convert
A clear technical guide to footcandles and lux: definitions, the exact conversion formula, real-world reference points, and application-based recommendations.
8 min read
Computing Energy Savings and ROI for LED Lighting Retrofits
Calculate exact ROI for LED retrofits. Include kilowatt-hour reductions, HVAC thermal load savings, and maintenance elimination in your financial payback models
16 min read
Point-by-Point Illuminance via Inverse Square Law
Mathematical guide to point-by-point lighting calculations using the inverse square law and Lambert's cosine law for direct illuminance tracking.
9 min read
Room Cavity Ratios (RCR): How Proportions Affect Lighting Efficiency
Calculate Room Cavity Ratios (RCR) accurately. Understand how room geometry and ceiling heights drastically impact coefficient of utilization and light loss
24 min read
Converting Nits to Candelas: Luminance vs. Luminous Intensity
The math behind converting nits to candelas. A clear technical explanation of luminance (cd/m²) versus luminous intensity (cd) for digital signage.
23 min read
Estimating Thermal Load from LED Fixtures for HVAC Sizing
Calculate thermal load generated by high-wattage LED fixtures. Provide accurate BTUh data to mechanical engineers for precise stadium HVAC sizing
18 min read
Vertical Illuminance Calculations for Facial Recognition and Broadcast
Master vertical illuminance calculations. Critical methodologies for designing lighting that ensures facial recognition for security cameras and sports broadcasts
16 min read
Spacing Criterion (SC): Optimizing Fixture Layouts for Uniformity
Use Spacing Criterion (SC) to determine maximum fixture spacing. Prevent scalloping and dark spots in interior corridors by applying correct SC multipliers
17 min read
Luminaire Dirt Depreciation (LDD): Environmental Categorization Guide
Accurately assign Luminaire Dirt Depreciation (LDD) factors. Categorize environments from clean rooms to heavy industry to ensure realistic photometric outputs
21 min read
Estimating Fixture Quantity Using the Lumen Method Formula
Quickly estimate required fixture quantities using the lumen method formula. A reliable engineering shortcut for preliminary lighting layouts and cost budgets
16 min read
Unified Glare Rating (UGR): Calculation Methods and Limitations
Understand the Unified Glare Rating (UGR) formula, interior glare calculations using software, and why UGR does not apply to exterior fixture applications
14 min read
Reading Coefficient of Utilization (CU) Tables in Lighting Spec Sheets
Demystify Coefficient of Utilization (CU) tables. Learn to interpolate reflectance values and cavity ratios to determine true fixture efficiency in any space
19 min read
Computing Light Loss Factor (LLF) for Accurate Photometric Models
Master the calculation of total Light Loss Factor (LLF). Combine recoverable and non-recoverable factors to ensure lighting designs meet long-term targets
15 min read
Spatial Daylight Autonomy (sDA): Metrics and Simulation Methods
An engineering overview of Spatial Daylight Autonomy (sDA). Calculate annual daylight availability to meet LEED v4 requirements and reduce electrical loads
15 min read
Calculating Equivalent Melanopic Lux (EML) for WELL Building Standards
Step-by-step Equivalent Melanopic Lux (EML) calculations. Convert visual lux to meet WELL v2 circadian criteria for optimal human-centric lighting design
19 min read
Lumen Depreciation: Projecting L70 and L90 LED Lifetimes accurately
Analyze L70 and L90 lumen depreciation metrics. Use TM-21 reports to accurately project the useful lifespan of commercial LED luminaires in harsh environments
16 min read