Recessed luminaires present safety challenges that surface-mounted or pendant luminaires do not. When a luminaire is installed into a ceiling cavity, thermal management changes fundamentally — heat generated by the driver and LEDs is trapped in an enclosed space rather than dissipated to open air. Building materials above the luminaire — particularly thermal insulation — can further restrict heat dissipation.
Additionally, recessed luminaires are installed into ceiling structures where their back-boxes and mounting brackets interface with construction materials — sometimes flammable ceiling boards, sometimes plasterboard, sometimes acoustic tiles. The fire safety of the materials and the thermal performance of the luminaire-ceiling combination is therefore critical.
IS 10322 (Part 5/Sec 2): 2026 addresses these specific risks in addition to the general requirements of IS 10322 (Part 1): 2026.
---This is the most significant new addition to the 2026 version. Air-handling luminaires are recessed fixtures specifically integrated into the building's HVAC system, designed to serve dual functions: providing illumination AND facilitating air circulation through the ceiling plenum.
Two types exist:
These luminaires are particularly common in commercial office buildings, hotel lobbies, and healthcare facilities, where integrated lighting and HVAC design reduces ceiling penetrations and improves air distribution.
IS 10322 (Part 5/Sec 2): 2026 introduces formal requirements for air-handling luminaires covering:
If you manufacture or import air-handling luminaires for the Indian market — this is the first time your product type has explicit mandatory certification requirements under an Indian Standard. You must obtain BIS CRS registration under IS 10322 (Part 5/Sec 2): 2026 to legally sell or import these products in India.
New marking requirements have been added that are specific to recessed luminaires:
All 12 changes in Part 1: 2026 (detailed in Article 3) apply — EMF requirements, touch voltage limits, photobiological safety, IPX9, PELV, and the battery/EDLC annexure where applicable.
---One of the most practically important requirements for recessed luminaires — and one that causes significant confusion among manufacturers — is the thermal insulation compatibility rating.
Non-IC rated luminaires must have a minimum air gap maintained between the luminaire and any thermal insulation in the ceiling. In practice, this means installers must physically push insulation away from the luminaire body. In many real installations, this requirement is ignored — particularly in retrofit projects — creating a genuine fire risk. IC-rated luminaires (Insulation Contact rated) are designed and tested for direct contact with thermal insulation. They typically achieve this through more conservative thermal design, lower operating temperatures, and materials tested for higher continuous temperatures.IS 10322 (Part 5/Sec 2): 2026 requires that the luminaire's IC rating (or non-IC status) is clearly indicated in the product documentation. When testing at House of Testing, we will conduct temperature rise testing under the appropriate conditions and help you determine the correct IC designation for your product.
---Fire hoods and intumescent fire-rated collars are construction products that interact with the luminaire during a fire. They are not part of the luminaire itself and are covered under separate Building Material standards.
However, fire hoods affect the luminaire's thermal performance — they enclose the back-box of the luminaire, restricting heat dissipation and raising operating temperatures. If your luminaire is intended for use with a fire hood, the temperature rise testing under IS 10322 (Part 5/Sec 2): 2026 should ideally be conducted with a representative fire hood installed.
If you test without a fire hood and the luminaire passes temperature limits, but field installations consistently use fire hoods — there is a risk that real-world operating temperatures exceed tested values. Our engineers can guide you on appropriate test configurations for fire-rated downlight applications.
Yes. An IP65 rating claim must be validated through testing per IEC 60529:
For bathroom applications where IP65 is required in Zone 1, this testing is mandatory. Additionally, IS 10322 Part 1: 2026 has updated IP testing methodology that applies.
Note that IP testing must be conducted on the complete luminaire assembly as it will be sold — including all seals, gaskets, and the driver enclosure. Disassembled components cannot be IP tested meaningfully.
The key distinction is whether the luminaire body is installed into the ceiling structure or mounted on the ceiling surface:
Recessed: The luminaire body is installed within the ceiling structure — a cutout is made in the ceiling, the luminaire body sits within the ceiling thickness, and typically only the trim ring or diffuser face is visible below the ceiling surface. The driver and LED module are within the ceiling cavity. Surface-mounted: The entire luminaire body sits below the ceiling surface — the ceiling is not cut, and the complete fixture (including driver housing) is visible below the ceiling.This distinction determines which Part 5 section applies:
Some luminaires are sold as both (surface-mount adapter kit included) — in this case, the more demanding standard applies, which is typically the recessed standard because of the more challenging thermal environment.
This depends on the product configuration:
Integrated driver (driver inside the luminaire housing): Certified as one product — the complete luminaire is tested and registered. Separately supplied driver (driver outside the luminaire, connected by cable): The luminaire body and the driver are each a separate electrical product. The driver would typically be certified separately under the relevant control gear standard (IS 15885 for LED control gear). The luminaire body (without driver) is certified under IS 10322 (Part 5/Sec 2).In practice, the vast majority of LED downlights sold in India have integrated drivers. If your product has the driver integrated within the ceiling-recessed housing — one certification covers the complete assembly.
If you supply luminaire and driver as a "kit" where the driver is surface-mounted separately (common in some commercial downlight systems) — you need to certify both components.
Suspended ceiling grid (T-bar or similar) installations present specific considerations for recessed luminaires:
For standard LED panel lights in a grid ceiling: IS 10322 (Part 5/Sec 2): 2026 applies. The air-handling requirements (the major new addition in 2026) are particularly relevant if your panels are used in buildings with plenum-return air HVAC systems.
The thermal insulation compatibility test simulates the thermal conditions when a luminaire is covered by ceiling insulation. The test procedure involves:
If the luminaire passes the test with insulation in contact — it receives an IC designation.
If temperatures exceed limits with insulation in contact — the luminaire is non-IC rated, and must be marked accordingly, with instructions indicating a minimum clearance from insulation.
Most standard LED downlights with drivers rated at 40°C maximum ambient are non-IC rated — the driver temperature rises above safe limits when covered by insulation. True IC-rated luminaires require specially designed, typically lower-power-density, lower-temperature drivers.
Air-handling luminaires are indeed present in the Indian market — used in premium commercial office buildings, five-star hotels, and healthcare facilities that have been designed with integrated lighting and HVAC systems, often by international MEP (Mechanical, Electrical, and Plumbing) consultants.
Prior to IS 10322 (Part 5/Sec 2): 2026, there was no Indian Standard specifically addressing air-handling luminaires. These products were either certified under the general fixed luminaire standard (IS 10322 Part 5/Sec 1) without air-handling specific testing, or not certified at all.
From August 2, 2026, air-handling luminaires are required to be certified under IS 10322 (Part 5/Sec 2): 2026 which now includes the specific requirements for this product type.
If you supply, specify, or install air-handling luminaires in India — you should be aware that the legal framework for their certification has now been established and will be enforceable.
Yes — dielectric strength failure (also called electric strength failure or Hi-Pot failure) is one of the most common failure modes in LED luminaire testing, particularly for lower-cost products.
The dielectric strength test applies a high voltage (typically 2 times the rated voltage plus 1000V, applied for 60 seconds, minimum 1000V) between live parts and accessible metal parts. If insulation breaks down — shown by a sustained current flow above the specified limit or a flashover — the test fails.
Common causes of dielectric strength failure in LED luminaires:
The fix for dielectric strength failure is typically design-level: increase creepage distances, use higher-specification insulation material, or add insulation barriers. This requires access to the luminaire's design team and can be time-consuming to implement and retest.
Pre-compliance testing at House of Testing before formal BIS submission is the most effective way to catch dielectric strength issues early.
As the BIS CRS registration holder, you are responsible for ensuring that products sold under your registration conform to what was tested. When a manufacturer makes changes to the product — even small changes like a different driver IC or different LED strip layout — you face a dilemma:
If you are unaware of the change: Your registered products are being sold in a different configuration from what was certified. BIS surveillance could detect this and result in licence action. If you are aware of the change: You must assess whether the change is material (affects safety or performance parameters) and if so, arrange retesting and register the change with BIS.The practical solution is to include a clause in your supplier agreement requiring advance notification of any product changes, and specifying that changes must be approved by you before implementation. Some brand owners also conduct periodic verification testing of market-purchased samples against their certification baseline.
When you are transitioning to IS 10322 (Part 5/Sec 2): 2026, take the opportunity to document the exact product specification (BOM, PCB version, driver specification) and include this in your supplier agreement as the approved baseline.
The maximum installation depth marking relates to the maximum depth of the ceiling cavity that is appropriate for your luminaire — ensuring the luminaire does not overheat when installed in a shallower-than-intended cavity.
If your luminaire body is 95mm deep but the ceiling is only 70mm thick (typical for some partition walls and thin ceiling systems), the driver may not fit, or may be forced into a cramped position that affects thermal performance.
The marking should indicate the minimum acceptable ceiling thickness/cavity depth for safe installation. This is determined by:
In your example, if the body is 95mm deep, the marking would indicate a minimum ceiling cutout depth of at least 95mm. If thermal testing shows the driver needs additional clearance above the body — say 20mm — the marking would indicate 115mm minimum.
Our engineers will help determine the appropriate installation depth marking during testing.