Transitioning From Incandescent to LED Pool Lighting in Cumming’s Older Pools

Every pool-remodel blog will tell you the same thing: rip the old niche out, pull new low-voltage wire, install a fresh color-changing LED, pay the bill. For a pre-2010 Cumming pool running a 120V incandescent, that advice is wrong more often than it’s right — and it costs homeowners roughly $1,000 in avoidable labor.

Here is the short version, before we get into the wiring diagrams and the Forsyth County permit desk. A homeowner in Vickery with a 2006 Pebble Tec pool and one dead Pentair Amerlite 500W incandescent has two real options. Option A: full niche conversion — pull the original 120V line, run new #12 AWG low-voltage to a transformer, install a new niche-compatible LED fixture, budget $1,200 to $1,800 for the job. Option B: unscrew the dead incandescent, thread a modern 120V LED retrofit lamp into the existing niche and GFCI, and pay $280 to $440 out the door.

Option B gets you roughly 70% of the performance of Option A at 40% of the cost. For most Cumming homeowners — especially the ones in their 50s and 60s who bought the house in 2008 and aren’t sure they’ll still be there in 2035 — Option B is the correct answer. The trade industry quietly hates saying that out loud because Option A pays the install crew four times as much. This post will walk you through exactly when each path is right, what to look for inside the existing niche before you choose, and how Forsyth County’s permit process handles each route.

Why Pre-2010 Cumming Pools Almost All Run 120V Incandescent

If your house was built in the Vickery, Hampton Park, or Polo Fields expansion wave between 2002 and 2009, there is roughly an 80% chance your pool light is a 120-volt incandescent — typically a Pentair Amerlite 78458100 or a Hayward Astrolite SP0583S, both 300W or 500W. Low-voltage LED niche fixtures didn’t hit mainstream residential spec sheets until Hayward’s Colorlogic 4.0 series landed around 2011, and they didn’t dominate new-build plans until about 2014.

The wiring matches the era. A 120V incandescent niche is fed directly from a GFCI-protected breaker back at the equipment pad — usually a 20-amp single-pole on a Sawnee EMC-served panel — through 3/4″ PVC conduit that terminates in a deck-mounted junction box. There is no transformer. There is no low-voltage feed. The full 120 volts land at the back of the niche, and the bulb itself handles the dissipation.

When that incandescent bulb dies — and they all die, usually between year 8 and year 12 — the homeowner is standing at a fork in the road most don’t realize they’re standing at. The bulb replacement itself is a $38 Amerlite R40. But if the bulb has already burned twice in five years, or the niche gasket is leaking, or the old 12-gauge feed wire is showing copper-green corrosion at the j-box, you are no longer talking about a bulb swap. You are talking about a system decision.

The Real Cost Breakdown: Full Niche Conversion vs. 120V LED Retrofit

Here is what a full low-voltage conversion actually costs in Forsyth County in 2026 — not the theoretical number, the invoice number — based on Primetime Pools’ last eleven jobs inside the 30040 and 30041 zips.

The $920 swing between the two paths is almost entirely labor. The retrofit lamp itself runs $200–$320 at the parts counter. The full-conversion fixture runs $380–$560. Everything else — the transformer, the wire pull, the permit, the second truck roll — is billable hours.

What You Actually Gain From the Extra $1,000

Full conversion gives you three things a retrofit lamp cannot match. First, color saturation — a true low-voltage fixture pushes somewhere around 1,100 to 1,400 effective lumens of colored light across the basin. A retrofit lamp pushes roughly 750 to 950. On a standard 16×32 Cumming rectangle you will see the difference. On a smaller spool or plunge pool, most people won’t.

Second, lifespan. A niche-native LED is rated to 30,000–50,000 hours. A 120V retrofit lamp is rated to 15,000–25,000 hours — respectable, but roughly half. If you run your pool light three hours a night, 180 nights a year, the retrofit makes it about 15–20 years. The full conversion makes it 30+.

Third, automation compatibility. Low-voltage color LEDs integrate cleanly with Pentair IntelliCenter and Hayward OmniLogic automation panels — which most new Cumming pools built after 2018 already have at the equipment pad. A 120V retrofit lamp gets color-changed manually by flipping the pool light switch on and off to cycle through preset scenes. It works. It just works like 2012.

When Full Niche Conversion Actually Pays Off — The 10-Year Rule

The decision hinges on one number: your ownership horizon. If you plan to own the Cumming house 10 or more years from today, the full conversion wins every long-run math problem. Below 10 years, the retrofit lamp wins.

Here is why. The full conversion carries roughly $1,000 in extra upfront cost. It saves you one retrofit-lamp replacement cycle (year 18–22) and gives you cleaner automation plus brighter color. At a modest assumed $35/year electricity savings (45W LED vs. 500W incandescent, 540 hrs/year), that’s $350 over 10 years — not huge. The real value is the second replacement cycle you avoid. If you’re the homeowner who pays that second $380 retrofit in 2044, congratulations: the full conversion from 2026 would have been cheaper by then.

But if you bought your Lake Windward house in 2008, your kids are in college, and you’re quietly watching three neighbors downsize to Vickery Village condos, the math flips. You are probably selling before the full-conversion payoff arrives. Put in the retrofit lamp. Pocket the $1,000. Let the next owner decide whether they want full conversion.

The Listing Photo Consideration Nobody Mentions

One more wrinkle for sellers. A retrofit lamp photographs almost identically to a full-conversion LED in a real-estate twilight photo. The listing agent shooting your Three Chimneys pool at 7:45 p.m. in June isn’t going to capture the 300-lumen gap. They’re going to capture “the pool glows blue and the agent’s drone likes it.” For home-sale-driven upgrades, the retrofit lamp is the correct spend. Reserve the full conversion for long-term residents.

The Forsyth County Permit Line That Trips Up Half the Homeowners

This is the detail the box-store installers usually get wrong. The Forsyth County Department of Planning & Community Development at 110 E. Main St., Cumming, treats these two jobs very differently in their electrical inspection workflow.

A 120V retrofit lamp going into an existing, previously permitted niche is classified as a like-for-like maintenance replacement. No permit. No inspection. The only compliance trigger is a working GFCI test before and after — which any licensed contractor will document in the job file.

A full niche conversion — new transformer, new low-voltage feed, modified equipment-pad wiring — is classified as an electrical alteration. It requires a pulled electrical permit, typically $85–$110 in 2026, with an inspector walk on both the pre-fill and post-energize phases. Turnaround from Forsyth County is usually 3–5 business days for permit issuance and 5–7 business days for inspection scheduling in peak season (May through July).

Translation: the retrofit lamp job can be done on a Thursday afternoon with zero paperwork. The full conversion job on a St. Marlo pool, done correctly, is a 4–5 week calendar event from signed quote to inspector sign-off. That calendar cost is real, and it shows up in pools that miss the Memorial Day swim window.

The Three Moments That Force Full Conversion, No Matter the Math

There are three conditions that move the decision off the spreadsheet and make full conversion non-negotiable. If any of them is true at your Cumming pool, stop reading about retrofit lamps and call for a full niche replacement.

1. The niche gasket has failed and water is intruding behind the fixture. You will see this as a waterline-level moisture stain on the deck-side j-box, or as GFCI nuisance tripping every 20–40 minutes of runtime. A retrofit lamp cannot fix a failed gasket. You have to pull the fixture, replace the gasket, and at that point the labor gap between “reset the old incandescent” and “install a full-conversion LED” is small enough that the full conversion wins.

2. The original 120V feed wire is corroded at the deck box. Forsyth’s higher humidity — driven by Lake Lanier proximity — accelerates copper oxidation at outdoor j-boxes. On pools older than 15 years, we pull the deck-box cover and find green fur on the terminals roughly one job in four. If that wire needs to come out anyway, pull low-voltage in its place while the conduit is open.

3. You are already doing a larger remodel. New plaster. New coping. New tile. If the pool is drained and the waterline is down 18 inches for plaster prep, the niche is accessible, the deck box is open, and the equipment pad is already being touched. The marginal cost of adding full LED conversion to a $28,000 remodel is maybe $900 — not $1,800 — because the labor is already mobilized. Roll it in.

The Automation Integration Test

One quick test to run before deciding. Walk to your equipment pad. Is there a Pentair IntelliCenter, Hayward OmniLogic, or Jandy AquaLink RS automation panel already installed? If yes, you almost certainly want the full conversion — the automation will control color scenes, dim schedules, and party modes natively. If the equipment pad is still running a basic Intermatic time clock with toggle switches, the retrofit lamp is the cleaner spec. Don’t install $1,500 of lighting into a $40 time clock.

What the Quote Should Actually List — Line by Line

Whether you take the retrofit path or the full-conversion path, the written quote from any Cumming contractor should itemize these specific lines. If they don’t, ask for them in writing. This is the difference between a $1,400 job and a $2,100 job for the same scope — it’s usually not skill, it’s quote transparency.

For a 120V retrofit lamp quote, you should see:

• Exact fixture model and wattage (e.g., Pentair IntelliBrite 601001, 42W color LED, 100 ft cord)
• Gasket inspection + replacement allowance (budget $18–$28 for a fresh Pentair 79108600 gasket)
• GFCI function test pre and post
• Bonding continuity verification
• Labor: flat-rate or hourly, capped

For a full niche conversion quote, you should see:

• New fixture model (Pentair IntelliBrite 5G 640122 or Hayward Colorlogic 320 LPCUS11100)
• Transformer spec (Intermatic PX100 or equivalent 100W multi-tap)
• Low-voltage wire gauge and length (typically #12 AWG, 80–120 ft depending on equipment-pad distance)
• Forsyth County permit fee passthrough
• Niche replacement allowance if existing niche is incompatible
• Plaster patch allowance around niche ring if needed
• Post-fill color-test visit

If either quote is just “$1,850 — pool light upgrade,” that’s not a quote. That’s a number. Ask for the breakdown.

The Bulb-Only Option Worth Mentioning

One last path nobody talks about. If your 120V incandescent died and your total usage is two dinners a month and the Fourth of July, you can still buy a $38 Amerlite R40 incandescent replacement and run it for another eight years. It is not efficient. It is not pretty. It is $38. For infrequent-use pools on a tight seasonal budget, this is a defensible answer. Just know that your next bulb swap will probably coincide with a failed gasket, which will coincide with a full-conversion conversation. Plan accordingly.

How Primetime Pools Walks the Decision With Cumming Homeowners

The intake call for a pool-light job at a Haw Creek or Sadie Farms address takes roughly 15 minutes, and it goes like this. First question: how long do you plan to be in the house? Second: when was the pool built and what’s at the equipment pad? Third: has the light failed, or is it working but outdated? Those three answers route 95% of jobs cleanly to either retrofit or full conversion before anyone drives to Cumming to look at a niche.

The on-site visit confirms three things the phone call can’t: gasket condition, deck-box wiring integrity, and whether the existing conduit path can accept low-voltage wire without a new trench. If any of those fail, the quote gets adjusted in real time. If all three pass, the homeowner gets a written quote within 48 hours covering both paths, with our recommendation called out.

What we don’t do — and what a lot of Cumming homeowners have been surprised by — is push full conversion on a homeowner whose retrofit-lamp math is clearly better. The $920 swing matters. A pool light is not a status symbol. It is a 45-watt object submerged 18 inches below waterline that makes the water look good at 8:30 p.m. in July. Spend what makes sense for how long you’ll be there, and keep the rest for the coping reseal in 2029.