COB Downlights and Spot Lights in Kolkata

What Is a COB Downlight?

COB stands for Chip-on-Board. Many small LED chips are mounted closely together on one board, so they work as a single, dense light source rather than a cluster of visible dots.

In practice, this gives three things buyers notice:

• A cleaner beam. Light comes from one concentrated point, so the beam is more even and the edge of the light pool looks sharper.
• Better control over direction. A single source works well with deep reflectors, anti-glare baffles and zoom optics. This is why COB is common in spot lights.
• A tidy look in the ceiling. Many designs set the COB emitter deep inside the fitting. You see the light on the surface below, not a bright point in the ceiling.

Wide, soft ambient light across a whole room is usually handled by LED panels. Downlights and spot lights are chosen when you want to place light more deliberately.

Good Quality at a Fair Price

Most homes do not need an expensive designer fitting in every ceiling cut-out. They need downlights that run cool, do not glare and keep working for years. That balance is what this collection is built around.

• Aluminium heatsinks on models such as ROLEX, COB ZOOM and D020037 draw heat away from the LED.
• Deep-set emitters and honeycomb louvres on DEEP COB, Y75 and Y95 reduce glare in living rooms and bedrooms.
• The T010-2.5 gives you 8W, three switchable colour temperatures, a 38-degree beam and an internal driver for ₹500.
• Most models come in warm, natural and cool white, with 3-in-1 switchable versions for a small extra cost.
• Many models carry a 2-year warranty. Check the individual product page for coverage.

The Range: Types of Downlights in This Collection

Recessed fixed downlights fit into a cut-out in the false ceiling and sit nearly flush. Models such as DEEP COB, D020438, D2015A, D381 and IDS-B suit general lighting in living rooms, bedrooms, corridors and offices. Several, including D020462, Y75 and Y95, use a honeycomb anti-glare louvre for more visual comfort.

Tiltable spot lights let you angle the beam onto a wall, artwork or display. ROLEX, D2088A, D020400, D020037, ASTRA and XQ-M2/2L all have adjustable heads. ROLEX and T010-2.5 are listed with a focused 38-degree beam.

Zoom beam fittings let the installer adjust how wide or narrow the beam is after fitting. COB ZOOM (10W to 50W) and the DFX12 and DFX24 linear downlights offer this. It is useful in retail and galleries, where displays change.

Surface-mounted downlights mount onto the ceiling instead of into it. They are useful where there is no false ceiling or not enough depth. D093SF, D095SF and SQ CYLINDER SF are surface-mounted models.

Mini and button spot lights are very small fittings for shelves, wardrobes, glass cabinets, bar units and stair steps. D421 and D215 start at 1W. D221 PENCIL COB is a slim 1W recessed spot, and D421 also comes in blue, green, pink and red.

Twin and linear spot lights place two or more light sources in one rectangular housing. They suit feature ceilings and retail layouts. Examples include TWIN COB, GS F55 RECTANGLE TWIN and the 5x2 and 10x2 LINEAR.

High-wattage downlights are needed for tall spaces. COB ZOOM and D020037 go up to 50W, which the D020037 listing describes for double-height lobbies and large showrooms.

Finishes across the range include white, black, gun black, gold, rose gold and silver. This lets the fitting either disappear into the ceiling or act as a visible design detail.

COB Light Price: What You Will Pay and Why

The COB light price in this collection starts at ₹230 for a 1W mini spot and goes up to ₹4,000 for the largest linear zoom downlight. Most everyday recessed downlights for homes fall between ₹500 and ₹1,300 per fitting.

Four things move the LED COB light price within a single model:

• Wattage. Higher output costs more. DEEP COB, for example, is listed at ₹800 for 7W and rises for 12W and 18W.
• Colour temperature option. 3-in-1 switchable versions, which toggle between warm, natural and cool white, usually cost slightly more than single-colour versions of the same fitting.
• Optics and adjustability. Tilt heads, zoom beams and twin sources add to the price.
• Finish. Decorative finishes such as gold and rose gold appear mostly on design-led models.

Choosing an LED Spot Light for False Ceiling Installation

• Cut-out size and ceiling depth. Recessed fittings need a hole of the right diameter and enough depth above the false ceiling. Some models, such as ROLEX and T010-2.5, list a 75mm cut-out. Check each product page before your ceiling contractor cuts.
• Internal or external driver. Fittings with an internal driver, such as T010-2.5, D215 and D421, are self-contained and quicker to install. Many larger models use an external driver that sits in the ceiling void. This keeps heat away from the LED and makes the driver easier to replace later, but it needs room above the ceiling.
• Fixed or adjustable beam. A fixed downlight is right for general lighting. For a false ceiling spot light aimed at a wall, painting or display, choose a tiltable head or a zoom beam.
• Colour temperature. Warm white suits bedrooms, living rooms and dining areas. Natural white works well in kitchens and offices, and cool white suits task areas and some retail displays. If you are unsure, a 3-in-1 switchable model lets you choose after installation.
• Glare control. In rooms where people sit or lie down, deep-set emitters and honeycomb louvres reduce direct glare.
• Wattage for the space. Mini spots of 1W to 3W are for accents. Around 5W to 12W suits most residential ceilings, and higher wattages are for larger or taller spaces.

For a detailed comparison, read our guide to the different types of LED downlights.

Where These Downlights Work Best

• Homes: living rooms, bedrooms, kitchens and corridors, with mini spots inside wardrobes, crockery units and display shelves.
• Retail and showrooms: tiltable and zoom spot lights for highlighting products and adjusting as displays change. For long display runs, track lights are another option.
• Hotels and restaurants: decorative finishes and warm white for lobbies, corridors, dining areas and guest rooms.
• Offices and reception areas: recessed downlights in natural or cool white for clean, even working light.
• High ceilings: 30W and 50W variants for double-height atriums, lobbies and large showrooms.

Looking for a Dimmable Downlight?

Dimming is not currently listed as a feature on any product in this collection. The 3-in-1 models switch between colour temperatures, which is different from dimming brightness.

If your project needs a dimmable downlight, contact our team before ordering. We can advise on whether a suitable option or driver is available. Dimmable LED fittings generally need a matching driver and a compatible dimmer, so confirm this at the planning stage, not after installation. If a dimmable ceiling panel would suit your space, the MWRP Recessed LED Panel is listed as dimmable.

Buy COB Downlights in Kolkata from Diamond Electrical Industries

Diamond Electrical Industries has been part of Kolkata's lighting trade since 1958. You can buy COB downlights directly from this collection online. Each product page lists the available wattages, colour temperatures, finishes and prices, and many models carry a 2-year warranty.

For larger residential projects, retail fit-outs or hospitality work in Kolkata, visit our showroom to discuss quantities and product selection. You can also plan downlights alongside our LED profiles and panel lights so the whole ceiling works together.