Lighting Depreciation Life — How to Maximize Tax Deductions on LED Lighting Upgrades

Lighting depreciation life is the IRS-defined period over which the cost of a commercial lighting system can be written off for tax purposes. Most commercial lighting qualifies as a Section 1250 asset with a standard 39-year life — but LED upgrades installed in operational nonresidential buildings typically qualify as Qualified Improvement Property with a 15-year life, making them eligible for bonus depreciation. For property acquired after January 19, 2025, 100% bonus depreciation has been restored under the One Big Beautiful Budget Act.

For commercial property owners and facility managers weighing an LED lighting upgrade, understanding depreciation is the difference between treating the project as a capital expense spread over decades and writing it off immediately. The IRS provides multiple pathways to accelerated depreciation for energy-efficient lighting — and the right pathway depends on how the lighting is classified, when it is placed in service, and what tax strategy the property owner is pursuing.

This guide covers IRS depreciation classes for lighting, bonus depreciation rules updated for 2025 and 2026, Section 179 expensing limits, cost segregation studies, lumen depreciation and its impact on financial planning, and how Access Fixtures product families — including EXTREME-LIFE fixtures rated L70 at 200,000+ hours — fit into a long-term depreciation and lifecycle cost strategy.

This page provides general educational information about lighting depreciation and tax incentives. It is not tax advice. Consult a qualified tax professional or CPA before making depreciation-related decisions for your specific property and tax situation. IRS rules change — verify current rates and limits with a tax advisor or at IRS.gov.

IRS Depreciation Classes for Commercial Lighting

The IRS classifies commercial lighting assets into categories that determine their depreciable life and eligibility for accelerated deductions. Understanding which classification applies to your lighting system determines how quickly you can recover the cost.

The QIP classification is the most important for LED upgrade projects. Any improvement to the interior of a nonresidential building that is already in service — replacing fluorescent fixtures with LED, upgrading HID high bays to LED, installing LED wall packs — typically qualifies as QIP. QIP assets have a 15-year depreciation life and are eligible for bonus depreciation, making them the fastest path to recovering the cost of a lighting upgrade.

Bonus Depreciation for LED Lighting Upgrades — 2025 and 2026 Rules

The key variable is acquisition date — not placed-in-service date. Property ordered and acquired after January 19, 2025 takes 100% bonus depreciation regardless of when it is installed. Property ordered and under a binding contract before January 20, 2025 follows the old TCJA schedule even if installed in 2026. Track your purchase orders and invoices carefully — the acquisition date determines your deduction.

Section 179 Expensing for LED Lighting

Section 179 of the IRS tax code allows businesses to immediately expense the full cost of qualifying property in the year it is placed in service, rather than depreciating it over time. For 2026, the Section 179 deduction limit is approximately $1,315,000, with a phase-out threshold beginning at approximately $3,330,000 of total qualifying property placed in service during the year.

• Section 179 is applied before bonus depreciation. If your qualifying property exceeds the Section 179 limit, bonus depreciation applies to the remainder.
• Section 179 requires taxable income. You cannot use Section 179 to create a net operating loss — deductions are limited to your business's taxable income for the year. Bonus depreciation has no taxable income limit and can create or increase a net operating loss.
• LED lighting upgrades as QIP qualify for Section 179. Improvements to the interior of operational nonresidential buildings — including LED retrofits — are eligible for immediate Section 179 expensing.

For most commercial LED lighting projects under $1,315,000, Section 179 provides the same immediate full deduction as 100% bonus depreciation — with the taxable income constraint as the key difference. For larger projects, bonus depreciation covers the excess without a taxable income limit. A tax professional can advise on the optimal combination for your specific situation.

LED Rated Life and Its Impact on Depreciation Strategy

Not all LED fixtures depreciate at the same rate in practice. The L70 rated life — the number of hours before a fixture loses 30% of its original lumen output — varies significantly between product families and directly affects the financial case for an upgrade.

The initial purchase price of a commercial lighting system is typically less than 15% of its total lifecycle cost. Energy and maintenance account for the remaining 85%+. A fixture with a longer L70 rating reduces the frequency of replacement cycles, extends the maintenance interval, and lowers total lifecycle cost — while the same tax incentives apply to the initial purchase regardless of rated life.

Over a standard 39-year IRS depreciation period, a facility running 12 hours per day would replace standard LED fixtures 3 to 4 times. An EXTREME-LIFE fixture rated L70 at 200,000+ hours may never require replacement within that window. Each replacement cycle carries fixture cost, labor cost, and potential facility downtime — none of which are recovered through depreciation on the original purchase.

Cost Segregation Studies and Lighting Depreciation

A cost segregation study is an engineering and tax analysis that identifies building components that can be reclassified from long-life real property (39 years) into shorter-life personal property (5, 7, or 15 years). For property owners with significant lighting assets, cost segregation can substantially accelerate depreciation deductions and improve cash flow.

Lighting systems that would otherwise be classified as 39-year Section 1250 assets can be reclassified as 5-year or 7-year personal property through a cost segregation study, depending on their function and the specific IRS guidelines applicable to the property type. The IRS allows this reclassification when components are identified through a detailed engineering analysis rather than a broad allocation.

Cost segregation studies are typically performed by engineering firms specializing in tax analysis and are most cost-effective for properties with building improvements or equipment costs exceeding $500,000. The first-year deduction increase from reclassifying lighting from 39-year to 7-year property — combined with bonus depreciation — can generate significant cash flow improvements in year one of an upgrade project.

Energy Policy Act Deductions for Energy-Efficient Lighting

The Energy Policy Act provides additional federal tax deductions for energy-efficient lighting improvements in commercial buildings. Qualifying installations can receive deductions of up to $0.60 per square foot when the lighting upgrade reduces lighting power density by at least 25% compared to ASHRAE Standard 90.1-2019.

To qualify for the full deduction, the lighting system must meet specific energy-saving thresholds and comply with ASHRAE Standard 90.1. LED retrofits that replace HID, fluorescent, or HPS systems typically achieve the required 25% reduction with significant margin — LED technology reduces energy consumption by 50–70% compared to these legacy systems under real operating conditions.

• Deduction: up to $0.60 per square foot for qualifying lighting improvements
• Threshold: 25% reduction in lighting power density vs ASHRAE 90.1-2019 baseline
• Applicable to: nonresidential commercial and government buildings
• Documentation required: energy modeling and certification confirming compliance

Key Factors Affecting Lighting Lumen Depreciation

Lumen depreciation — the gradual reduction in light output over a fixture's service life — affects both illumination compliance and financial planning. A system that no longer meets minimum footcandle requirements for the application may need to be replaced before its IRS depreciation life expires, creating an unplanned capital expenditure.

Recoverable factors

• Fixture dirt depreciation. Dust and debris accumulation on lenses reduces light output. Regular cleaning restores a significant portion of lost output and is a manageable maintenance task.
• Lamp burnouts. In multi-lamp fixtures, individual lamp failures reduce system output. Proactive relamping schedules maintain illumination levels.

Non-recoverable factors

• LED chip degradation. LED chips lose lumen output gradually over time — this is the L70 rating. Higher-quality chips with better thermal management degrade more slowly.
• Driver fatigue. LED drivers fail over time due to capacitor degradation. First-generation LED fixtures installed before 2018 are now experiencing widespread driver failures — this is a non-recoverable factor that often triggers full fixture replacement before the IRS depreciation life expires.
• Ambient temperature effects. LED performance is sensitive to operating temperature. Fixtures in high-heat environments experience accelerated lumen depreciation unless specifically rated for those conditions.

Assuming all LED products experience lumen depreciation at the same rate is a common planning mistake. EXTREME-LIFE fixtures use superior thermal management and higher-grade components that maintain lumen output longer — directly reducing the risk of illumination non-compliance within the depreciation period.

Timing and Compliance for Claiming Lighting Depreciation

The IRS defines property as "placed in service" when it is ready and available for its intended use — not when it is ordered or paid for. This distinction matters for bonus depreciation because the placed-in-service date determines which tax year the deduction is claimed, while the acquisition date determines which bonus depreciation rate applies.

• Acquisition date — date of purchase or binding contract. Determines bonus depreciation rate (pre or post January 20, 2025).
• Placed-in-service date — date the fixture is installed and operational. Determines the tax year of the deduction.
• ASHRAE compliance documentation — required for Energy Policy Act deductions. Must be certified by a qualified engineer.
• QIP requirements — improvement must be to an interior of an operational nonresidential building. New construction does not qualify as QIP.

Common Mistakes to Avoid in Lighting Depreciation

• Classifying LED retrofits as 39-year property when they qualify as 15-year QIP — the most costly classification error and one of the most common.
• Missing the acquisition date cutoff for bonus depreciation. The difference between acquiring a fixture before or after January 20, 2025 is the difference between a 40% deduction and a 100% deduction on the same property.
• Assuming all LED products depreciate equally. Product quality — reflected in the L70 rating — determines how long a fixture meets illumination requirements. A cheaper fixture that fails before its depreciation life expires generates an unplanned replacement cost.
• Failing to document ASHRAE compliance. Energy Policy Act deductions require certification. Without it, the $0.60 per square foot deduction is unavailable regardless of how efficient the lighting system is.
• Overlooking cost segregation for large projects. For properties with significant lighting assets, not commissioning a cost segregation study may mean leaving substantial first-year deductions unclaimed.

Conclusion — The Right LED Fixture Improves Both Operations and Tax Strategy

Lighting depreciation is not just an accounting exercise — it is a capital planning decision that connects fixture selection, tax strategy, and operational cost. The IRS provides multiple pathways to recover the cost of an LED lighting upgrade faster than the standard 39-year depreciation schedule: QIP classification with 15-year life, 100% bonus depreciation for property acquired after January 19, 2025, Section 179 immediate expensing, and Energy Policy Act per-square-foot deductions for qualifying energy-efficient installations.

The fixture specification decision amplifies the financial outcome. An EXTREME-LIFE LED fixture rated L70 at 200,000+ hours costs more upfront than a standard LED but reduces lifecycle cost by eliminating replacement cycles that a standard fixture would require within the same depreciation window. Specify fixtures with the longest rated life your application budget allows — the tax incentives apply to the purchase either way, and the operational savings compound over the full depreciation period.

To discuss LED product specifications, rated life data, and lifecycle cost projections for your commercial lighting upgrade, call an Access Fixtures lighting specialist at 800-468-9925.

Tax rates, IRS limits, and bonus depreciation rules referenced in this guide reflect current law as of October 2026. Congress may modify these provisions. Always consult a qualified tax professional or CPA before making depreciation-related decisions for your specific property and tax situation.

Frequently Asked Questions — Lighting Depreciation Life

You have questions about lighting depreciation, bonus depreciation for LED upgrades, and tax strategy for commercial lighting projects. We have answers on the lighting side. For tax advice specific to your situation, consult a qualified CPA. If you have questions about LED product specifications, rated life, or lifecycle cost, call 800-468-9925.