About Diamond Electrical Industries

Lighting Kolkata since 1958

Diamond Electrical Industries began in Kolkata in 1958, making conventional lighting for homes and businesses. Decade by decade the work evolved, from tube lights to high-efficiency LED systems, and today to a complete smart lighting ecosystem ready for modern homes. Many customers simply call us Diamond Electrical or Diamond Lighting, and online you will find us as Dew Diamond at dewdiamond.com.

1958

Founded in Kolkata

2005

Started LED lighting

65,000+

Orders completed

Showrooms in Kolkata

Our Journey

1958
The beginning. Diamond starts in Kolkata with conventional lighting and electrical products.
2005
The move to LED. Production shifts to high-efficiency LED systems, and the range grows every year after.
Today
Smart lighting. Nerva smart gateways, switches, sensors and the artificial skylight bring the range into connected homes.
2026
A new showroom. The Esplanade East showroom opens alongside Poddar Court, with both showrooms ready to show every light switched on.

Engineering Excellence

Where architectural lighting meets smart automation, reliability is not optional. Every LED fixture, driver and smart gateway goes through engineering checks designed for demanding electrical and environmental conditions.

Diamond quality checks: Indian grid hardened, BIS certified, thermal testing, photometric and colour consistency testing, and hi-pot testing

Grid resilience and certified safety

Built-in surge protection and voltage fluctuation resistance protect the circuitry against power spikes and brownouts, with BIS certification for national safety and performance standards.

100% batch testing

Every unit is checked before it leaves: thermal testing for heat sink performance, photometric and colour consistency checks for output and colour temperature, and hi-pot insulation testing for user safety.

IP-rated endurance

IP65, IP67 and IP68 outdoor and underwater fixtures go through dust and water ingress testing, plus thermal shock and gasket stress checks so seals stay sound in heat and rain.

Smart protocol validation

Nerva gateways, drivers and switches are tested for Zigbee and Matter over Thread pairing, mesh range under load, flicker-free dimming and safe recovery from interrupted firmware updates.

Support That Stays After the Sale

Trade and affiliate programs

Trade pricing, bulk support and dedicated account management for interior designers, architects, electrical contractors and builders, plus partner programs for distributors and sales associates. Start a project enquiry.

Diamond after-sales support and replacement warranty

In-house support and 2-year replacement

An in-house technical team handles troubleshooting and repairs. For most of the catalogue, if a technical or manufacturing issue appears within 2 years of purchase, the unit is replaced with a new one.

The People Behind Diamond

Our senior sales and technical team brings over 20 years of field experience to every project, led by an executive team that pairs deep industry heritage with technical and financial expertise.