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
| Spec | T5 HO fluorescent | LED |
|---|---|---|
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 look | More variability — can be pushed harder |
Electricity (per W) | T5 ~70 lumens/W | Modern 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 | Higher | Lower |
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.
Which one should you buy?
reefcalcs pick
AI Hydra 32HD
The 5-year math favours LED — no bulb replacements, lower draw, and per-channel ramping T5 can't do. The Hydra 32HD is the value entry into genuine SPS-grade output.
~$475 · Where to buy →If you want full spectral control
EcoTech Marine Radion XR15 Pro G5
The most programmable fixture in the hobby and the one most SPS show tanks are built around. Buy it for Mobius and the channel control, not for extra PAR.
~$500 · Where to buy →Under 40 gal
AI Prime 16HD
On a small cube the Hydra is overkill and the Prime already covers a 24-inch footprint for LPS and mixed. Same app, a third of the price.
~$220 · Where to buy →Affiliate links. As an Amazon Associate, reefcalcs earns from qualifying purchases.
Also mentioned above
Affiliate links. As an Amazon Associate, reefcalcs earns from qualifying purchases.
Related calculators & references
Sources & references
- 01Joshi — PAR data from popular fixtureshttps://reefs.com/magazine/product-review-lighting-for-reef-aquaria-tips-on-taking-light-measurements/
- 02Reefco Aquariums — PAR Levels for Coralshttps://reefcoaquariums.com/blogs/news/par-levels-for-corals-sps-lps-soft-corals
Last reviewed