LED Lighting

Homeowner Summary

Switching to LED lighting is one of the simplest and highest-ROI energy improvements you can make. LEDs use 75-80% less energy than incandescent bulbs and 30-40% less than CFLs, while lasting 15,000 to 50,000 hours (10-25 years of typical use). A whole-home conversion from incandescents to LEDs typically costs $100 to $300 in bulbs and saves $150 to $300 per year in electricity.

The key numbers to understand when buying LEDs are lumens (brightness), color temperature (warmth or coolness of the light), and CRI (how accurately colors appear under the light). A 60-watt incandescent replacement is an 800-lumen LED that uses only 8-10 watts. For most living spaces, look for 2700K (warm white) with a CRI of 90 or higher.

Dimming compatibility is the most common source of frustration with LEDs. Not all LEDs are dimmable, and not all dimmers work well with LEDs. If you want dimming, buy LEDs labeled "dimmable" and pair them with a dimmer switch rated for LED loads.

How It Works

LEDs (Light Emitting Diodes) produce light by passing electrical current through a semiconductor material, which emits photons. Unlike incandescent bulbs (which heat a filament until it glows) or CFLs (which excite gas to produce UV light that strikes a phosphor coating), LEDs convert electricity to light with minimal heat waste.

Lumens vs watts: Lumens measure brightness; watts measure energy consumption. The old habit of buying "60-watt bulbs" should be replaced with "800-lumen bulbs." More lumens = more light, regardless of wattage.

| Incandescent Equivalent | Lumens Needed | Typical LED Wattage | |------------------------|---------------|-------------------| | 40W | 450 | 5-6W | | 60W | 800 | 8-10W | | 75W | 1,100 | 11-13W | | 100W | 1,600 | 15-18W |

Color temperature is measured in Kelvin (K):

• 2700K (Soft/Warm White): Similar to incandescent. Best for living rooms, bedrooms, dining areas.
• 3000K (Warm White): Slightly brighter feel. Good for kitchens, bathrooms, general use.
• 3500K (Neutral White): Balanced. Good for kitchens, offices, task areas.
• 4000K (Cool White): Crisp, energizing light. Good for workshops, garages, commercial spaces.
• 5000K+ (Daylight): Very bright and blue-toned. Best for task lighting, workshops, reading. Can feel harsh in living spaces.

CRI (Color Rendering Index) measures how accurately a light source renders colors on a scale of 0-100, where 100 is perfect (natural sunlight). Standard LEDs typically score 80-85 CRI. High-CRI LEDs score 90-98 and make everything look more vivid and natural. For living spaces, 90+ CRI is recommended. For closets and garages, 80+ is adequate.

Dimmable vs non-dimmable: Dimmable LEDs contain additional circuitry that allows them to reduce output smoothly. Non-dimmable LEDs on a dimmer will flicker, buzz, or fail prematurely. Dimmable LEDs cost $1-$3 more per bulb. You also need a compatible dimmer switch — older leading-edge (triac) dimmers designed for incandescents often cause LED flickering. Trailing-edge dimmers or dimmers specifically labeled "LED compatible" (e.g., Lutron Caseta, Leviton Decora Smart) solve this.

Retrofit vs new fixture: Retrofit LEDs (replacement bulbs) screw into existing fixtures using standard bases (E26, E12, GU10, etc.). They are the simplest upgrade. Integrated LED fixtures have the LEDs built in with no replaceable bulb — when the LEDs eventually fail, you replace the entire fixture. Integrated fixtures are often slimmer, more efficient, and better designed, but the trade-off is fixture replacement rather than bulb replacement.

Maintenance Guide

DIY (Homeowner)

• LEDs require virtually no maintenance during their operating life
• Dust fixtures periodically to maintain light output (dust buildup can reduce output by 10-20%)
• Replace any LED that begins flickering, changing color, or dimming significantly
• If LEDs flicker on a dimmer, try replacing the dimmer with an LED-rated model before replacing bulbs
• For recessed cans, keep insulation clear of non-IC-rated housings (LED retrofit kits run much cooler than incandescents but the fixture rating still applies)

Professional

• During electrical inspections: Verify LED retrofit bulbs in recessed cans are rated for the fixture type (enclosed, damp/wet, IC-rated). Check for proper dimmer compatibility. Ensure no incandescent-era dimmers remain on LED circuits.
• Landscape lighting: Clean and adjust outdoor LED fixtures annually. Check wire connections for corrosion. Verify transformer output matches LED load requirements.

Warning Signs

• Flickering (usually a dimmer compatibility issue, not a bulb failure)
• Color shift (light becoming noticeably more blue or pink over time)
• Significant dimming compared to when bulbs were new
• Buzzing or humming from the bulb or dimmer switch
• LED bulb fails well before rated lifespan (may indicate heat issues in an enclosed fixture)
• Multiple LEDs on the same circuit failing simultaneously (possible voltage issue)

When to Replace vs Repair

Replace bulb when:

• LED has visibly dimmed, shifted color, or started flickering
• Bulb has reached end of rated life (most homeowners will never reach this)
• Upgrading from lower CRI to higher CRI for improved light quality

Replace dimmer when:

• LEDs flicker, buzz, or do not dim smoothly on an older dimmer
• Dimmer minimum load exceeds the total LED wattage on the circuit (common with older 600W dimmers and a handful of 10W LEDs)

Replace fixture when:

• Integrated LED fixture has failed (no replaceable bulb)
• Fixture is incompatible with LED bulbs (some antique or specialty fixtures)
• Upgrading to a modern integrated LED fixture for better aesthetics or performance

Cost perspective: LEDs are inexpensive enough ($2-$10 per bulb) that troubleshooting a failing bulb rarely makes sense. Replace the bulb. If the problem persists, investigate the circuit or dimmer.

Pro Detail

Specifications & Sizing

| Parameter | Typical Residential LED Range | |-----------|------------------------------| | Efficacy | 80-130 lumens per watt | | Lifespan (L70) | 15,000-50,000 hours | | CRI | 80-98 | | Color temperature | 2700K-5000K | | Power factor | > 0.7 (standard), > 0.9 (commercial-grade) | | Base types | E26 (standard), E12 (candelabra), GU10 (track), GU24, PAR30/38 | | Operating temperature | -20C to 45C (typical) | | Dimmable range | 5-100% (high-quality), 10-100% (standard) |

L70 and L90 ratings: LED lifespan is measured as the point where output drops to 70% (L70) or 90% (L90) of initial lumens. A 50,000-hour L70 rating means the LED produces at least 70% of its original brightness after 50,000 hours of operation. It does not mean the LED stops working at that point.

Sizing for rooms: General rule is 10-20 lumens per square foot for ambient lighting in living spaces, 30-50 lumens per square foot for task areas (kitchens, offices), and 5-10 lumens per square foot for accent lighting.

Common Failure Modes

• Driver failure: The LED driver (built-in power supply) is the most common failure point. Heat is the primary enemy. Enclosed fixtures without ventilation accelerate driver failure. Quality drivers are rated for 50,000+ hours; cheap drivers may fail in 5,000-10,000 hours.
• Thermal degradation: LEDs in enclosed fixtures or recessed cans with insulation contact run hotter, accelerating both phosphor degradation (color shift) and driver failure. Always use bulbs rated for enclosed fixtures in enclosed housings.
• Dimmer incompatibility: Leading-edge (triac) dimmers designed for resistive incandescent loads cause visible flicker at 120Hz, audible buzz, limited dimming range, and premature LED failure. The solution is always an LED-rated dimmer.
• Voltage fluctuations: LEDs are sensitive to voltage quality. Brownouts, sags, and surges can cause flickering or premature failure. Whole-home surge protection is recommended.
• Phosphor degradation: Over very long operation (20,000+ hours), the phosphor coating that converts blue LED light to white can degrade, causing a shift toward bluer light. This is normal aging and not a defect.

Diagnostic Procedures

1. Flicker diagnosis: Use a smartphone slow-motion camera (240fps) to capture LED flicker. Constant 120Hz flicker indicates dimmer incompatibility. Random flicker suggests loose connection or driver issue.
2. Heat assessment: Measure bulb surface temperature after 1 hour of operation. LED bulbs should not exceed 80C (176F) at the base. Temperatures above this indicate inadequate ventilation or an incompatible fixture.
3. Dimmer compatibility testing: Replace the suspected dimmer with a known LED-compatible model (e.g., Lutron Caseta). If flicker stops, the dimmer was the issue. Check that total LED wattage on the circuit exceeds the dimmer's minimum load rating.
4. Circuit voltage check: Measure voltage at the fixture with a multimeter. Should be 118-122V AC. Significant voltage drop from the panel indicates undersized wiring or overloaded circuit.
5. Color verification: Use a color temperature meter or a calibrated smartphone app to measure actual color temperature and CRI against rated specifications.

Code & Compliance

• Energy Star: Voluntary certification for LED bulbs and fixtures. Requires minimum efficacy, CRI 80+, lifetime testing, and warranty (3 years for bulbs, 5 years for fixtures).
• DLC (DesignLights Consortium): Certification for commercial LED products. Higher performance thresholds than Energy Star.
• California Title 24 (JA8): California requires high-efficacy lighting in new construction. LED fixtures must meet JA8 standards for dimmability, flicker, color quality, and efficiency. JA8-listed bulbs are required in high-efficacy luminaires.
• NEC Article 410: Governs luminaire installation. Relevant for retrofit LEDs in existing fixtures: the LED rating must match the fixture rating (IC/non-IC, damp/wet, enclosed).
• Fire rating: LED retrofit kits in fire-rated recessed housings must maintain the fire rating. Use only listed retrofit kits compatible with the specific housing.

Cost Guide

| Item | Typical Cost | Notes | |------|-------------|-------| | Standard LED bulb (A19, 800 lm) | $2-$5 | 60W equivalent, 2700K-3000K | | High-CRI LED bulb (90+ CRI) | $5-$10 | Noticeably better color rendering | | LED dimmer switch | $20-$50 | Lutron, Leviton LED-rated models | | Recessed LED retrofit kit (6 in) | $10-$25 | Replaces incandescent trim + bulb | | Whole-home LED conversion (30 bulbs) | $100-$300 | DIY bulb replacement | | Integrated LED fixture | $30-$200 | Wide range by style and quality | | Under-cabinet LED strip | $30-$100 | Per linear foot installed | | Landscape LED conversion | $200-$600 | New LED fixtures + transformer |

ROI calculation: A single 10W LED replacing a 60W incandescent saves 50W. Running 4 hours/day at $0.16/kWh, that is $11.68/year per bulb. A $3 LED pays for itself in about 3 months. A 30-bulb home conversion saves roughly $150-$300/year.

Energy Impact

Lighting accounts for approximately 10-15% of residential electricity consumption. Converting from incandescent to LED reduces this to 2-4% of total consumption.

Per-bulb savings: Each 60W incandescent replaced with a 10W LED saves approximately 50 kWh per 1,000 hours of use. At average US electricity rates, that is about $8 per 1,000 hours per bulb.

Whole-home impact: A typical home with 30 light fixtures consuming an average of 40W each (mix of incandescent and CFL) draws 1,200W when fully lit. Converting to LED reduces this to approximately 300W — a 75% reduction in lighting energy.

Secondary savings: LEDs produce 80-90% less heat than incandescents. In air-conditioned climates, this reduces cooling costs by an additional 10-15% of the lighting savings (because the AC does not have to remove the heat the lights produce).

Comparison to CFL: LEDs use 30-40% less energy than CFLs, last 2-5 times longer, contain no mercury, reach full brightness instantly, and dim far more smoothly. CFLs are being phased out and should be replaced with LEDs as they fail.

Shipshape Integration

Lighting energy tracking: When paired with circuit-level energy monitors (Emporia Vue) or smart lighting systems, Shipshape tracks lighting energy consumption as a separate category on the home dashboard.

Efficiency scoring: Homes with LED lighting throughout score higher on the Energy subscore of the Home Health Score. Shipshape estimates lighting efficiency based on home age, known fixture types, and energy consumption patterns.

Replacement reminders: For integrated LED fixtures with known installation dates, SAM tracks estimated remaining life and recommends replacement planning as fixtures approach end of rated life.

Cost tracking: Estimated savings from LED conversion are calculated based on pre-conversion and post-conversion energy data, displayed as monthly and cumulative totals.

Anomaly detection: Unusual increases in lighting circuit energy consumption may indicate a failing LED driver drawing excess power or a fixture reverting to incandescent (e.g., after a handyman visit). SAM flags these anomalies for review.

Dealer actions: Service providers can recommend lighting upgrades as part of energy efficiency assessments. Shipshape provides fixture counts and estimated savings to support the recommendation.