# Vapor-Tight Wet Area LED Lighting: IP Ratings Guide | Maes

> Real IP66-IP69K and NEMA 4X ratings for Maes vapor-tight LED families, by application — wash bays, food processing, and general wet locations.

Canonical page: https://maeslighting.com/post/vapor-tight-wet-area-led-lighting-guide

Technical article

# Vapor-Tight Wet Area LED Lighting

"Waterproof" is not a rating, and "vapor-tight" only means something once it is backed by a documented IP or NEMA figure. At [Maes Lighting](https://maeslighting.com/) our [vapor-tight LED lineup](https://maeslighting.com/products/vapor-tight-lighting) publishes ingress ratings directly on each family's spec table, and this guide works through what those ratings actually mean, what each Maes family documents, and which family fits which wet-area application — including the one family in the lineup whose ingress rating is not published in the source and has to be confirmed directly.

## What Makes a Fixture Vapor-Tight Rather Than Just Water-Resistant?

A vapor-tight fixture is sealed against moisture, dust, and — depending on the rating — direct washdown, using gasketed lenses and housings tested to a specific IP or NEMA figure rather than a marketing description. "Water-resistant" and "waterproof" are not standardized terms; IP (Ingress Protection) and NEMA enclosure ratings are the documented figures that actually specify what a fixture withstands, and they are what should appear on a spec sheet in place of either word.

## How Do IP and NEMA Ratings Actually Work?

An IP code has two digits. The first covers protection against solid objects and dust, on a 0–6 scale where 6 means fully dust-tight. The second covers moisture, on a 0–9K scale where higher numbers indicate resistance to more forceful or sustained water exposure — IP65 and IP66 cover low-pressure and powerful water-jet exposure respectively, while IP69K adds close-range, high-temperature, high-pressure washdown. NEMA ratings run in parallel to IP codes but originate from a different standards body; NEMA 4X specifically adds a corrosion-resistance requirement on top of its ingress protection, which matters anywhere cleaning chemicals, salt air, or washdown chemistry are also present. A fixture can be rated to more than one standard at once, and a serious spec table lists the actual figures rather than a single umbrella claim. The distinction matters most at the point of failure: a fixture rated only for splash exposure that is installed where it will actually face direct pressure washdown is not a minor spec mismatch — it is the difference between a sealed enclosure and one that fails early from water intrusion it was never tested against.

## What Are the Documented IP and NEMA Ratings, By Family?

Four Maes vapor-tight families and one food-processing family publish ingress ratings directly on their spec tables:

**Maes wet-area families: documented ingress ratings and output range**

| Family | Ingress / NEMA rating | Listings | Output range |
| --- | --- | --- | --- |
| R5 | IP66, IP69K, NEMA 4X, IK10 | NSF, ETL, DLC | 3,500–20,000 lm, 15–125 W selectable, 2/4/8 ft |
| CIT4 | IP65, IP66, IP67, NEMA 4X | UL Wet Location, NSF | 3,166–35,391 lm, 17–210 W, 2/4 ft |
| CIT2 | IP65, IP66, IP67, NEMA 4X | UL, NSF, RoHS | 3,166–23,594 lm, 17–140 W, 2/4/8 ft |
| SL | IP69K, IK10 | NSF | 2,600–7,800 lm, 20–60 W, 2/4/5 ft |
| LS-VT | Not specified in source; confirm directly | DLC Premium, ETL, 50,000 h rated | 5,400–8,100 lm, 40–60 W, 4 ft |

LS-VT is the one family in this list where the published spec table lists DLC Premium and ETL listings plus a 50,000-hour rating, but does not carry an IP or NEMA figure in the source reviewed for this guide. Do not assume an ingress rating for LS-VT from its general "vapor tight" family name — confirm the actual figure with Maes before specifying it for any washdown or standing-moisture application.

## What Is Washdown-Rated (IP69K) Lighting, and When Do You Need It?

IP69K is a specific, more demanding test than IP66 or IP67: it certifies a fixture against close-range spraying with high-temperature, high-pressure water, the exact condition produced by steam-cleaning and pressure-washdown equipment. Standard IP65 or IP66 fixtures are built for hose-directed water and general dust and moisture exposure — a wash bay, an exterior loading area, a covered outdoor space — but are not tested to the same washdown-specific standard. In food and beverage processing specifically, fixtures also typically need an NSF listing alongside the IP figure, confirming the housing meets sanitation requirements for a food-contact-adjacent environment. Within the Maes lineup, R5 and SL both document IP69K plus NSF; SL is built specifically for the food-processing category, while R5 is the vapor-tight family with the broadest published wattage range at that same washdown rating.

## Which Family Fits Which Wet-Area Application?

The right family depends on the specific exposure, not just "wet" as a general category:

- Food and beverage processing, direct washdown: [SL](https://maeslighting.com/products/food-processing-lighting/sl), purpose-built for the category at IP69K and NSF, or [R5](https://maeslighting.com/products/vapor-tight-lighting/r5) where a wider wattage and lumen range is needed at the same washdown rating.
- Wash bays and pressure-washdown areas outside food processing: R5, for its documented IP69K plus NEMA 4X corrosion resistance.
- General wet locations — parking structures, covered exterior areas, standard splash and hose exposure: [CIT2](https://maeslighting.com/products/vapor-tight-lighting/cit2) or [CIT4](https://maeslighting.com/products/vapor-tight-lighting/cit4), both documented to IP65/66/67 and NEMA 4X, with CIT4 covering the higher end of the wattage range (up to 210 W, 35,391 lm) and CIT2 covering a lower-wattage 2/4/8-foot range.
- Moderate-output 4-foot applications where ingress has already been confirmed directly: [LS-VT](https://maeslighting.com/products/vapor-tight-lighting/ls-vt), at its documented 40–60 W range and 50,000-hour rating.

## How Do CIT2 and CIT4 Compare at the Same Wattage Point?

CIT2 and CIT4 share the same IP65/66/67 and NEMA 4X ingress ratings and overlap directly at the low end of their wattage ranges — both publish a 2 ft, 17 W, 3,166 lm entry point — which makes the difference between them a matter of listing and top-end output rather than ingress protection. CIT4 carries a UL Wet Location listing specifically and documents a 4 ft, 210 W, 35,391 lm top model; CIT2 carries a general UL listing plus RoHS and documents an 8 ft, 140 W, 23,594 lm top model. In practical terms, CIT4 is the family to specify where a UL Wet Location listing is a stated project requirement or where a higher-wattage 4 ft fixture is needed, while CIT2 is the family that extends to an 8 ft form factor at a lower per-fixture wattage ceiling.

## What Voltage and Operating Temperature Ranges Do These Fixtures Support?

R5 is documented at 120 to 277 V standard, with 120 to 347 V available as an option, across an operating temperature range of -40°C to +40°C — a range wide enough to cover most enclosed and semi-enclosed wash areas, including unconditioned spaces in cold climates. LS-VT is documented at 100 to 277 V, across -4°F to 104°F. CIT2 and CIT4 both list their standard driver as 0 to 10 V dimmable, with other voltages available on request per their spec tables, though neither publishes a specific ambient operating temperature figure in the source reviewed for this guide — confirm that figure directly for an installation with unusual ambient extremes.

## Best Practices for Installing Vapor-Tight Fixtures

- Match the IP and NEMA rating to the actual exposure — pressure washdown calls for IP69K, not IP65 or IP66, and NEMA 4X where corrosive cleaning chemicals are used, not just any IP figure at all.
- Confirm LS-VT's ingress rating directly before specifying it for a washdown or standing-moisture application — its published spec table does not carry an IP or NEMA figure, unlike the other families in this lineup.
- Use wiring methods and fittings rated for wet locations under the [National Electrical Code (NFPA 70)](https://www.nfpa.org/codes-and-standards/nfpa-70-standard-development/70) at every connection point — a correctly rated fixture wired through an unrated fitting breaks the wet-location rating at that joint.
- Hire licensed electricians familiar with wet-location and washdown installations specifically, since inspection and sign-off standards for these areas differ from standard dry-location work.
- Re-verify the seal after any service work that opens the fixture housing — an ingress rating only holds if the gasket and lens are correctly reseated afterward.

## Why Has LED Replaced Fluorescent in Wet and Washdown Areas?

The mechanical case for LED in wet areas is straightforward: a sealed LED array has no gas-discharge tube to fail from thermal cycling or vibration, and no mercury content to manage as regulated hazardous waste under the [EPA's universal waste rule](https://www.epa.gov/hw/frequent-questions-about-universal-waste) at end of life — relevant specifically in a wet or washdown enclosure, where relamping means breaking the fixture's seal and re-establishing its ingress rating afterward. Our [fluorescent vs. LED explosion-proof lighting guide](https://maeslighting.com/post/fluorescent-vs-led-explosion-proof-lighting) covers the same mechanism in more detail for hazardous-location fixtures specifically; the seal-integrity argument applies the same way in a vapor-tight, non-hazardous wet enclosure. A sealed, long-rated LED fixture reduces how often that seal needs to be broken at all, which is the more meaningful maintenance advantage in a washdown environment than any single efficiency percentage. LS-VT's documented 50,000-hour rating illustrates the same point directly — at true 24/7 continuous operation that works out to roughly 5.7 years before the rated hours are used up, and considerably longer than that at a typical intermittent commercial duty cycle, all of it time the fixture's seal is never asked to be broken and re-verified for a relamping visit.

## Specifying Vapor-Tight Lighting for a Wet-Area Project

Start by identifying the actual exposure the space presents — standard splash and hose-directed water, sustained washdown at pressure and temperature, or washdown plus food-contact-adjacent sanitation requirements — and match it against the documented ingress rating in the table above rather than a general "vapor-tight" label. Our [maintenance guide](https://maeslighting.com/post/explosion-proof-lighting-maintenance) covers how to verify a fixture's seal integrity stays intact after installation. Share your space's exposure type, required wattage, and any NSF or food-processing requirement with our team through [our project support page](https://maeslighting.com/contact-us) for a fixture match by application.

## Need a project review?

Share the application, operating conditions and required documentation with a lighting specialist.

[Request a quote](https://maeslighting.com/contact-us)

Common questions

## Frequently asked questions

These answers clarify the selection process without replacing project-specific documentation.

**How do I choose vapor-tight lighting for my space?**

Check five factors: IP65+ rating, materials resilient to moisture and chemicals, 12,000+ lumens with CRI 80+, energy efficiency, and the specific needs of your application.

**How do they compare with fluorescent in wet areas?**

Vapor-tight LEDs use up to 50% less energy, last over 50,000 hours, and hold their sealing where fluorescent fixtures degrade.

**What keeps them performing?**

Certified installation to NEC wet-location standards, strategic placement away from direct water paths, and routine seal and lens maintenance.

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Maes Lighting — nationwide supplier of certified explosion proof, industrial, high-temperature,
food-processing, vapor-tight, high-bay, flood, area, and emergency LED lighting.
Headquarters: Broken Arrow, Oklahoma. Sales: (866) 860-6399 · tjacobs@maeslighting.com
Website: https://maeslighting.com