Explosion Proof Lighting Blog | Guides & Technical Articles

October 2026 · 8 min read

In the HID era, wattage was a reasonable proxy for brightness: a 400W metal halide was a 400W metal halide. With LED that link is broken — two explosion proof LED flood lights with the same 150W on the label can differ by 40% in the light they actually deliver on the ground. This guide sets out what to compare instead, with real replacement data from our own certified range, and the one comparison that matters more than any of the numbers: buying the right protection concept for your zone.

Why Wattage Stopped Meaning Anything

Wattage measures electricity consumed, not light produced. The ratio between the two — efficacy, in lumens per watt — is now the variable that separates a good LED explosion proof light from a mediocre one. HID lamps delivered roughly 60–100 lumens per watt at the fixture level once you accounted for the ballast and the reflector. LED sources range from about 100 to over 160 lumens per watt, and the difference between the two ends of that range is a 60% swing in the lighting installation you end up with.

The practical consequence: a 150W LED flood light from one manufacturer can out-deliver a 200W LED flood light from another. Quoting "we need 200W flood lights" to a supplier therefore specifies the electricity bill, not the lighting result. The better specification is the maintained lux level you need over the task area — the supplier's job is to hit it with the fewest watts that also survive the environment.

Lumens, Lux and What to Actually Specify

Three terms, three different things, and datasheets often blur them:

When comparing two explosion proof LED lights, the question that gets a real answer from a real manufacturer is: "what is the delivered luminaire output and the efficacy of this model, and what mounting height and spacing achieves my target lux?" The answer should come with IES or LDT photometric files so your own engineer can verify it rather than trust it.

HID and Fluorescent to LED: Real Replacement Data

These are the replacement ratios we publish for our own certified range — the wattage of LED that replaces the legacy lamp at equivalent or better installed light:

Two observations worth taking away. First, the saving is consistently 40–50% — that is the realistic band for like-for-like LED replacement, and anyone promising 70%+ on a like-for-like swap is usually also cutting the delivered light. Second, the replacement ratios above only hold because the LED fittings deliver their light through a designed optic; a bare "wattage match" onto a random fitting will not reproduce it.

What the Explosion Proof Enclosure Does to the Light

An explosion proof enclosure is not optically neutral. In a flameproof (Ex db) fitting, the light leaves through a thick, certified front lens, and every internal surface absorbs something before it gets there. That is why the number that matters is the luminaire-level output, measured with the enclosure on — not the LED module's rating on the chip datasheet, which can be 20–30% higher than what exits the fitting.

This is also why the fixture design matters as much as the LED: reflector geometry, lens material and the spacing between the light source and the lens decide how much of the generated light reaches the ground. When a datasheet quotes efficacy, check whether it is declared for the luminaire. If the document does not say, ask — the difference is not small.

Heat: The Real Lifetime Limit

LEDs do not usually fail suddenly; they fade. Lifetime is expressed as L-values — L80B20 means the light holds at least 80% of its initial output for the stated hours, with 20% of the batch allowed to fall below. Our high bay, flood and linear families are rated L80B20 above 100,000 hours at 25 °C (the BT8 tube, 50,000 hours).

The number that governs whether you see that lifetime is the temperature the fitting actually experiences. Our range is rated for ambient temperatures of -20 °C to +55 °C. For installations in the Gulf, site ambient near the luminaire can approach that ceiling on a rooftop or above a process unit — so thermal path design (the housing acting as a heat sink, not a sealed box) is what keeps the electronics inside their limits. In a flameproof enclosure, where the electronics sit inside a sealed, thick-walled housing, the thermal engineering is harder than in an open industrial fitting, which is exactly where cheap designs cut corners.

Temperature Class Is Not a Wattage Question

A common and dangerous assumption: "more watts means hotter, so a T6 rating must be a low-wattage light." Not so. The temperature class (T1 to T6, with T6 the strictest at 85 °C maximum surface temperature) is certified for the complete design — housing, heat sinking, driver, LED load. The same housing family can carry T6 at one wattage and T5 at a higher one; that is why our flood light markings read T6/T5 across the power range, not a single letter.

The practical rule: never derive the temperature class from the wattage. Read it from the Ex marking of the specific model and power step you are buying, and match it to the auto-ignition temperature of the gases present in your area. Our guide to reading and verifying Ex certification covers how the marking encodes this.

The Comparison That Matters More Than Lumens: FL7 vs FL8

Here is the trap that wastes more money than any efficiency difference: buying a Zone 2 light for a Zone 1 area. Our two flood light families use the same LED technology, but they exist because the zones are different:

Notice something that surprises many buyers: the Zone 2 fitting is rated IIC while the Zone 1 fitting is IIB. Gas group and zone are independent axes — the restricted-breathing concept happens to be certified for the more severe gas group. That does not make the FL8 usable in Zone 1: the zone is determined by the protection concept (Gb vs Gc), not by the gas group. A lighting calculation can fix a lux shortfall; only reclassification or the right fitting can fix a zone violation.

The LED Lineup at a Glance

Across the range the environment ratings are consistent: IP67 and IK10 (the BT8 tube is IP33 with IK10), C4 corrosion protection per ISO 12944 for coastal and chemical atmospheres, and 100–277 V input. Where a project needs a different CCT, 3000K and 4000K are available across the families as options.

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