Case Study 15-1: The Rodriguez Lighting Upgrade
When Good Intentions Meet Real Complexity
Isabel Rodriguez had been meaning to upgrade the lighting in their 1982 townhouse for two years. She knew the theory: switch to LEDs, save energy, improve light quality. She'd done it for clients in her architecture practice dozens of times — specifying fixtures, reviewing photometric studies, selecting color temperatures. How hard could it be in her own home?
The answer, it turned out, was "more complicated than expected, but ultimately very manageable" — as long as she stopped making assumptions and actually looked at what was in the walls.
Phase 1: The Initial Attempt
Isabel started with the dining room. She bought a six-pack of "warm white dimmable LED A19" bulbs (the packaging said 2700K, 800 lumens, dimmable) and installed them in the existing chandelier-style ceiling fixture, which was controlled by a dimmer switch. She dimmed them down to a comfortable level for dinner that evening.
The results were immediately wrong. Two of the six bulbs flickered noticeably. A third produced a faint but audible buzz from the ceiling fixture. When dimmed below about 50%, all six bulbs pulsed in a subtle strobing pattern. The warm romantic dinner atmosphere she'd expected felt instead like a misfiring nightclub.
She put it down to defective bulbs and returned them for a different brand. Same result with the second set.
Miguel, who had a more systematic approach to troubleshooting, looked up the dimmer switch. It was the original dimmer installed when the house was built in 1982 — a rotary Lutron dimmer, model number partially legible. He found on the Lutron website that it was a TRIAC forward-phase dimmer rated for 40W minimum, 600W maximum, designed exclusively for incandescent loads. Their six LED bulbs drew a total of 54 watts — above the minimum, but the electronics in the LED drivers were completely incompatible with the old TRIAC switching pattern.
A new Lutron Diva CL dimmer ($28) replaced the old one in about 20 minutes. The LEDs dimmed smoothly to 10% with no flicker, no buzz, no pulsing. Problem solved.
Lesson 1: The dimmer switch is half the dimming system. LED-incompatible dimmers cannot be fixed by changing bulbs.
Phase 2: The Recessed Light Discovery
Emboldened by the dining room success, Isabel moved to the living room — a higher-ceiling space with six recessed fixtures installed in the early 1990s during a previous owner's renovation. She picked up six BR30 LED retrofit kits, turned off the breaker, removed the first trim ring, and found herself looking at a label that read: "CAUTION: Not for use in insulated ceilings."
Non-IC fixtures. She climbed into the attic the next Saturday with a flashlight.
What she found was not subtle: all six recessed cans had loose fiberglass batt insulation resting directly against and over the top of the cans. Two of the cans had the insulation packed tight enough that the tops weren't even visible. The previous installer had either not known or not cared about the IC requirement.
She tested the worst-case scenario by touching the outside of a can after the lights had been on for two hours. It was hot — not warm, hot. Hot enough that she pulled her hand back immediately.
"This was a fire hazard for fifteen years before we bought the house," she told Miguel. "And we've been running these lights daily for three years."
The solution was straightforward: IC-rated LED retrofit kits. She ordered six Halo 6" LED retrofit kits ($24 each) — IC-rated, air-sealed, 90 CRI, 2700K. Installation was simple: pull the old BR30 bulb, snap the retrofit LED module in from below, plug the integrated driver into the existing socket. The retrofit kits' flanged design sealed against the ceiling plane, eliminating the air leakage. Total time: 90 minutes for all six. Total cost: $144 versus a professional installation estimate of $420.
She also pulled the insulation back from the cans in the attic — technically, even IC-rated fixtures benefit from insulation clearance for airflow, and she wanted the R-30 insulation value restored properly over the can tops rather than packed around the sides.
Lesson 2: Recessed lights in older homes frequently have the wrong IC rating for their installation context. The fix is straightforward, but you have to know to look for the problem.
Phase 3: Color Temperature Chaos
With the fire hazard addressed and the dimmers working, Isabel turned to a problem that had been nagging her since they moved in: the living room felt visually unsettled. She'd dismissed it as a furniture arrangement issue, but working through the lighting upgrade forced her to actually inventory what was in the room.
The results were revealing: - Living room overhead recessed lights: the original BR30 floods, which she'd never looked at closely. They turned out to be 3000K. - Two floor lamps with incandescent bulbs: roughly 2700K equivalent (incandescents don't have a rated color temperature, but they fall around 2700K) - Table lamp in the reading corner: a CFL she'd bought years ago. The box, still in a drawer, read 4100K. - A decorative lamp Miguel had bought at a sale: the bulb was unlabeled, but testing it next to a known 5000K bulb suggested it was similar.
The room had four different color temperatures ranging from warm incandescent orange to cool near-daylight blue. Her architect's eye had been noticing this all along without identifying it.
She replaced everything with 2700K LEDs (90 CRI throughout, since she was replacing them anyway). The shift was immediate and obvious — the room felt cohesive and warm rather than slightly confused.
Lesson 3: Mixed color temperatures in a single room create a visually dissonant effect that's often perceived as vague "off-ness" rather than identified as a lighting problem. Consistency within rooms is simple and makes a large difference.
The Final Accounting
Isabel's complete lighting upgrade covered 42 fixtures throughout the townhouse over approximately six weekends of work:
- 42 LED bulbs and retrofit kits: $287 total (mix of standard A19s, BR30 retrofits, and IC retrofit kits)
- 3 new LED-compatible dimmer switches: $84
- Estimated monthly savings vs. previous mixed incandescent/CFL/LED setup: ~$22/month
- Payback period: ~17 months
The two lessons she brought back to her architecture practice: First, always specify LED-compatible dimmers alongside LED fixtures — don't assume the existing dimmer is compatible. Second, always check IC rating when specifying recessed fixtures in insulated ceilings, and always note that existing non-IC cans cannot be "grandfathered in" — any attic insulation above them is a hazard that needs addressing.
What Would Have Gone Differently Without Investigation
If Isabel had stopped at "the dimmers are weird but it's probably just these LEDs" and never investigated further: - The non-IC recessed lights would have continued operating with insulation direct-contact for years longer - The energy savings from the recessed LED upgrade would have been partially offset by significant air leakage through the non-sealed cans - The color temperature chaos would have continued affecting the feel of the living room
The investigation itself — going into the attic, looking up the dimmer model, inventorying bulb specifications — took about four hours total. The results shaped how they approached every subsequent room and revealed a genuine fire-safety issue that had been present for years.
Sometimes the most valuable thing a homeowner can do is slow down, look carefully, and understand what they actually have before deciding what to do about it.