LED vs Incandescent: What 6 Years of Signify Orders Taught Me About Making the Switch

The Question Everyone Asks — But Usually Asks Wrong

When I first started handling commercial lighting orders back in 2018, I assumed the question was simple: "Should I go with LED or incandescent?" A few months in, I realized the real question is "What exactly am I optimizing for?"

By early 2019, I'd made enough mistakes to fill a small filing cabinet. The first big one? A 200-piece order of small downlights for a retail tenant improvement. I specified incandescent because the upfront cost was lower. The client approved. The contractor installed them. Two months later, the client called: their electric bill had jumped 40%. We ended up eating the cost of a full swap to LED — roughly $3,200 down the drain. That's when I learned that "cheaper" isn't cheap when you factor in everything else.

So let's break this down — and I'll share what I wish someone had told me before I made those early mistakes.

Here's the framework I now use whenever someone asks me to compare LED and incandescent. We'll look at five dimensions:

• Light Quality & Color Accuracy — Does it look good, not just bright?
• Energy Efficiency & Heat — Where does the electricity actually go?
• Total Cost of Ownership (TCO) — The real cost, not the sticker price.
• Control & Dimming — Can you actually control the light the way you want?
• Lifespan & Maintenance — How often do you need to touch it?

Each dimension has a clear winner — and at least one might surprise you.

1. Light Quality & Color Accuracy — Incandescent Wins the Warmth Battle (But Only Just)

The Conventional Wisdom

Everyone says incandescent has "better light quality." Warm, natural, flattering. And for a long time, that was true. Most early LEDs had a cold, bluish tint and terrible Color Rendering Index (CRI). I remember ordering a batch of early LED Signify shallow downlights in 2019 and thinking, "This looks like a hospital waiting room."

What I Found in Practice

If you compare a standard incandescent bulb to a cheap LED? Incandescent wins, no contest. But modern Signify luminaires — especially their Philips Master LED line and their shallow downlight series — have come a long way. The newer models hit CRI 90+ and tunable white (2700K to 4000K) that rivals incandescent warmth.

Here's the thing: incandescent still has a slight edge in absolute color rendering, especially at low dimming levels. But that edge is now so thin that only high-end retail, art galleries, or photography studios will notice. For warehouses, offices, or industrial spaces? Not a factor. I made that mistake once — specifying incandescent for a photography studio's ambient lighting, but for a Signify high bay warehouse? LED all day.

Verdict: For most commercial applications, modern Signify LEDs match incandescent color quality within 90-95%. For high-end retail or art spaces, you might still want incandescent (or the very top-tier LEDs with CRI > 95). But for 95% of B2B uses, this is no longer a deciding factor.

2. Energy Efficiency & Heat — LED Destroys Incandescent, Period

The Uncontested Fact

Incandescent bulbs convert roughly 90% of their energy into heat, not light. An LED converts that same energy into about 80-90% light and only 10-20% heat. That's not a small difference — it's an order of magnitude.

The Real-World Impact

On a Signify high bay installation I managed in 2021 (150 fixtures, each 150W equivalent), we compared LED vs. incandescent:

• Incandescent: 150W per fixture, 22,500W total. Plus, the heat output would have required an additional 5 tons of cooling capacity.
• LED (Signify High Bay): 30W per fixture, 4,500W total. Minimal heat, no extra cooling.

The energy savings alone paid for the LED fixtures within 2 years. The cooling savings? That was a bonus we didn't even factor into the initial ROI calculation.

Verdict: This isn't even a competition. If energy cost or heat is a concern, LED is the only logical choice. Signify's high bay and shallow downlight fixtures are specifically designed to minimize thermal load while maximizing light output.

3. Total Cost of Ownership — The Surprise Most Buyers Miss

The Obvious Trap

Sticker price: incandescent wins. You can buy an incandescent bulb for $1-3. An equivalent Signify LED costs $10-25. Case closed, right?

Wrong. I've seen this trap destroy budgets three times. Let me give you the real math.

The Real Math (Based on 2025 Pricing)

Scenario: A commercial office needs 200 Signify small downlights. We estimate 8 hours/day operation, 5 days/week, 50 weeks/year. Electricity cost: $0.12/kWh (US average, 2024).

Incandescent (60W equivalent):

• Initial fixture cost: $200 per fixture × 200 = $40,000
• Annual energy cost: (60W × 8hrs × 250 days × 200 fixtures) ÷ 1000 × $0.12 = $2,880/year
• Lifespan: 1,000 hours ≈ 4 months. You'll replace each bulb 3 times/year. Bulb cost: $3 × 3 × 200 = $1,800/year
• 5-year TCO: $40,000 + ($2,880 + $1,800) × 5 = $63,400

LED (Signify 12W LED downlight):

• Initial fixture cost: $350 per fixture × 200 = $70,000
• Annual energy cost: (12W × 8hrs × 250 days × 200 fixtures) ÷ 1000 × $0.12 = $576/year
• Lifespan: 50,000 hours ≈ 25+ years. Replacement cost: $0 for 25 years.
• 5-year TCO: $70,000 + $576 × 5 = $72,880

At first glance, incandescent looks cheaper at 5 years. But by year 8 (assuming minimal labor for bulb replacements), LED pulls ahead. By year 10, LED has saved you $10,000+. And you never have to think about bulb replacements again.

Verdict: If your project horizon is 3 years or less, incandescent can seem cheaper. If you're building for 5+ years (which most commercial spaces are), LED is the clear winner. The break-even point is around 4-6 years for most Signify fixtures.

4. Control & Dimming — Incandescent's Last Stand (Sort Of)

The Conventional Wisdom

Incandescent dims beautifully. You turn a knob, the light warms up and dims smoothly. LEDs? Early models flickered, dimmed unevenly, or required expensive, specific dimmers.

What I've Learned the Hard Way

This used to be true. In 2019, I specified LED for a fancy restaurant and the dimmers caused visible flicker. The client was furious. We swapped to incandescent at triple the cost.

But modern Signify fixtures — especially their connected lighting and control systems — have changed the game. Their DALI-compatible drivers, LuxSense, and Interact IoT platform give you precise digital control (0-100% smooth dimming) without the flicker. You can even program zones, schedules, and daylight harvesting.

That said, cheaper LEDs still flicker. If you're using a generic LED without a proper driver, you'll get flicker and poor dimming. With a good Signify driver (like the Xitanium series), you get smooth, flicker-free dimming down to 1%.

Verdict: With a quality Signify LED and compatible driver, dimming is now on par with incandescent. But if you're on a budget and using cheap no-name LEDs, incandescent still dims better. For this, you get what you pay for.

5. Lifespan & Maintenance — The Invisible Cost of Incandescent

The Hidden Burden

Incandescent bulbs last ~1,000 hours. That means in a typical commercial setting (8 hours/day, 250 days/year), you're replacing every bulb every 6 months. In a Signify high bay installation with 200 fixtures: that's 400 bulb changes per year. Each change costs labor, downtime, and ladder time.

The Real Numbers

If a maintenance technician costs $50/hour and can change 20 bulbs per hour, that's 20 hours of labor for 400 bulbs: $1,000/year in labor alone. Over 10 years: $10,000.

With Signify LEDs (50,000 hours life), you never change a bulb. That $10,000 labor cost essentially goes away.

Verdict: For any location where changing bulbs is inconvenient, dangerous, or expensive (high ceilings, difficult access, 24/7 operations), LED is a no-brainer. The maintenance savings alone can justify the higher upfront cost.

The Bottom Line: A Practical Decision Framework

After 6 years and way too many mistakes, here's the simple framework I use:

Choose LED (Signify or equivalent) if:

• You're optimizing for long-term cost (5+ year horizon)
• Energy costs are a concern
• You want control features (dimming, zoning, daylight harvesting)
• Maintenance is difficult or expensive
• Heat output is problematic (e.g., refrigerated spaces, tight ceilings)

Choose incandescent if:

• Your budget is extremely tight and the project is temporary (< 3 years)
• You need perfect color rendering at very low dimming levels (e.g., luxury retail, art galleries)
• You're replacing an existing incandescent system and can't justify the upfront cost of a full switchover

Honestly, for 90% of commercial and industrial applications, modern LED — especially from a reliable brand like Signify — is the better choice. But don't take my word for it blindly. Run the numbers for your specific scenario. Every project is different.

As of January 2025, based on US average electricity prices ($0.12/kWh) and publicly available product pricing. Energy costs and product prices vary by region and may have changed. Always verify current pricing before making purchasing decisions.