reefcalcs

Comparison

T5 HO fluorescent vs LED

T5 high-output fluorescent vs LED reef lighting compared on PAR, spectrum, electricity cost, lifespan, and coral coloration. The right answer in 2026 is usually 'hybrid' — here's why.

The contenders

Side A

T5 HO fluorescent

ATI Sunpower, Aquaticlife, Giesemann

Side B

LED

Radion, AI Hydra, Reefi, Kessil

Spec-by-spec

SpecT5 HO fluorescentLED

PAR distribution

Even across footprint (linear tube)Hot-spotted directly under puck

Spectrum control

Bulb choice only (4–6 bulbs)Per-channel programmable

Coral coloration

Saturated, classic lookMore variability — can be pushed harder

Electricity (per W)

T5 ~70 lumens/WModern LED ~120–150 lumens/W

Bulb life

12–15 months (peak spectrum)5–7 year fixture life

Cost (year 1)

$300–800 fixture + $100/yr bulbs$400–1,500 fixture + $0/yr

Cost (5 year total)

$800–1,300$400–1,500

Sunrise/sunset programming

On/off only (timer)Yes — full programmable ramp

Heat output

HigherLower

Which one for which situation

Wide tank (>24 in front-to-back), full coverage SPS

Pick: T5 HO fluorescent

T5 covers wide footprints without shadow. Pure-LED setups need many pucks to match the spread.

Small tank (<40 gal cube), want programmable spectrum

Pick: LED

LED's per-channel control + ramping is the modern default for small tanks. T5 has no programmability.

Want maximum coral fluorescence pop

Pick: LED

Pure-blue LED channels at high intensity drive fluorescence harder than any T5 bulb mix.

Long-term lowest cost

Pick: LED

5-year math favors LED — no bulb replacement, lower electricity, longer fixture life.

Best of both worlds (any budget)

Pick: Either works

Run an ATI Hybrid or a LED fixture above + 2 T5 actinic bulbs. Best PAR distribution + best color control. Most serious SPS tanks land here.

Ad slot · Article inline

Where to buy

T5 HO fluorescent

AI Hydra 32HD

Standard SPS-grade fixture. 24×24 in footprint at SPS PAR.

View on Amazon →

AI Prime 16HD

Best small-tank reef light. Up to 24×24 in coverage for LPS/mixed.

View on Amazon →

LED

AI Hydra 32HD

Standard SPS-grade fixture. 24×24 in footprint at SPS PAR.

View on Amazon →

EcoTech Marine Radion XR15 Pro G6

Best programmable channel control. 24×24 in SPS-grade.

View on Amazon →

Kessil A360X Tuna Blue

Pendant-style. Best 'shimmer' in the hobby. 24×24 in coverage.

View on Amazon →

Affiliate links. As an Amazon Associate, reefcalcs earns from qualifying purchases.

Related calculators & references

Sources & references

  1. 01
    Joshi — PAR data from popular fixtures
    https://reefs.com/magazine/par-data-from-marine-aquarium-lights-comparing-popular-fixtures/
  2. 02
    Reefco Aquariums — PAR Levels for Corals
    https://reefcoaquariums.com/blogs/news/par-levels-for-corals-sps-lps-soft-corals

Last reviewed