Comparison · Chennai

LED vs CFL vs Tube Light — 5-Year Cost Comparison (Chennai)

LED, CFL or the old fluorescent tube light — which is actually cheapest over 5 years in a Chennai home? This guide runs the real numbers: unit cost, running cost, replacement cycle, and total cost of ownership at Chennai's 2026 electricity tariff.

Published Apr 2026 · By Santosh Electricals team

The three technologies, compared side-by-side

Metric	LED bulb (9 W)	CFL (15 W)	Tube light (40 W T8)
Light output (lumens)	810 – 900	750 – 900	2,400 – 2,800
Efficacy (lm / W)	90 – 100	50 – 60	60 – 70
Typical price (2026)	₹120 – ₹180	₹140 – ₹180	₹180 (tube) + ₹250 (fixture)
Rated life (hours)	25,000 – 30,000	6,000 – 8,000	6,000 – 10,000
Warm-up time	Instant	30 – 60 sec to full brightness	Instant but flicker-start
Mercury content	None	3–5 mg	~10 mg
Heat output	Low	Medium	High
Dimmable?	Yes (dimmable SKUs)	No (most)	No

Running cost — at Chennai tariff

TANGEDCO domestic tariff, 2026 (post-subsidy, 201–400 unit slab): ₹6.55 per kWh. Assume 6 hours/day usage.

Tech	Wattage	Daily (6 hr)	Monthly (30 d)	Yearly (365 d)
LED 9 W	9 W	0.054 kWh = ₹0.35	1.62 kWh = ₹10.61	19.7 kWh = ₹129
CFL 15 W	15 W	0.090 kWh = ₹0.59	2.70 kWh = ₹17.69	32.9 kWh = ₹215
Tube light 40 W	40 W (+5 W ballast loss)	0.270 kWh = ₹1.77	8.10 kWh = ₹53.06	98.6 kWh = ₹646

Running a single tube light = 5x the electricity cost of a single LED. In a typical 2BHK with 12 light points running 6 hrs/day, swapping from tube lights to LED saves ~₹6,000 per year.

Replacement cycle — how often you re-buy

At 6 hours/day usage:

LED (25,000 hr rated) — lasts 11.4 years. You will replace it maybe once.
CFL (7,000 hr rated) — lasts 3.2 years. You will replace it 3–4 times in 10 years.
Tube light (8,000 hr rated) — lasts 3.6 years. Plus ballasts/starters fail separately.

5-year total cost — single light point

Let's compute full cost of ownership for one light point running 6 hrs/day, over 5 years:

Tech	Fixtures bought	Initial cost	5 yrs electricity	5-yr TCO
LED 9 W	1 fixture (still under 50% life)	₹150	₹645	₹795
CFL 15 W	2 fixtures (second one partway through)	₹320	₹1,075	₹1,395
Tube light 40 W	1 fixture + 2 tube replacements	₹610	₹3,230	₹3,840

LED is 75% cheaper than tube light over 5 years, per light point. Multiply by 10–15 lights in a typical 2BHK.

Whole-home 5-year projection

Assume a 2BHK with this lighting mix (realistic Chennai home, 2026):

8 ceiling lights (living, bedrooms, kitchen, dining)
4 bathroom / utility lights
2 balcony / outdoor lights

Whole-house setup	Initial cost	5-year electricity	Total 5-yr cost
All LED	₹2,100	₹9,030	₹11,130
Mixed CFL + LED	₹3,600	₹14,500	₹18,100
All tube light (legacy)	₹8,540	₹45,220	₹53,760

Going all-LED saves ₹42,000+ over 5 years vs legacy tube setup in a 2BHK. Add another ₹12,000–₹18,000 if you include ACs offsetting lower ambient heat load from LEDs (yes, this is real).

LED — what to actually buy in Chennai

For a typical 2BHK, here's our go-to spec:

General ceiling points — Asmon 12W round LED panel (160 mm cut-out). ~960 lumens, 4000K neutral white.
Over bed / reading area — Asmon 6W spot or Panasonic 9W bulb, 3000K warm white.
Kitchen counter — 20W LED tube (replaces 40W T8). 6500K cool white for visibility.
Bathroom — 8W IP44 downlight, 4000K.
Balcony / outdoor — 9W LED bulb in a weatherproof fitting.

Full range in our LED lighting category.

Common objections to switching (and answers)

"LED light is cold / harsh" — only if you buy 6500K everywhere. 3000K LED is indistinguishable from incandescent warmth.
"LED bulbs fail early" — cheap unbranded ones do. Branded LEDs (Asmon, Panasonic, Havells, Philips) genuinely last 8–10 years in Chennai conditions.
"Upfront cost is high" — for a whole 2BHK, ~₹2,100. Pays back in 4–5 months from electricity savings alone.
"What about power cuts / voltage spikes?" — LED drivers handle 140V–280V. Surge-related failures happen but are warranty-covered for 1 year.

When to actually keep a tube light

Workshop or garage with large area + high ceiling — 2x 40W tube still cheaper than 4x 18W LED panels upfront. Tubes lose on running cost but win on initial cost.
Temporary installation — construction shed, event venue — if it'll be taken down in a year, don't invest.
Heritage / retro aesthetic — some restaurants want the old tube look. Use LED-retrofit tubes that fit existing fixtures.

The answer

For any permanent residential or commercial installation in 2026 Chennai — all-LED, no exceptions. The 5-year savings pay for a new washing machine. The 10-year savings pay for a small fridge. The environmental and heat-load benefits are free on top.