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.

Concealed Light, Downlight or Spot Light: What Is the Difference?

These names are often used for the same family of fittings, which causes confusion at the shop counter.

• Concealed light is the everyday Kolkata term for any light fitted inside the false ceiling so that only the face shows. COB downlights and recessed panels are both called concealed lights.
• Downlight means the fitting throws light straight down, for general lighting of a room or corridor.
• Spot light means a narrower, focused beam, often with a tiltable head, used to highlight a wall, an idol, artwork or a display.

So when someone asks for a concealed COB light for the living room, they usually mean a recessed COB downlight in the 7W to 12W range.

COB or SMD Downlight: Which Is Better?

Many homes use both: panels or profiles for overall brightness and COB downlights where the light should feel placed and premium.

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.
• 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 Downlights by Room

• Living room: anti-glare honeycomb models such as Y75 or Y95 in warm white or 3-in-1, with tiltable spots aimed at a feature wall. Our room decoration lights ideas show more combinations.
• Bedroom: deep-set warm white downlights placed away from the bed head, so you never look straight into the light when lying down.
• Kitchen: natural white downlights placed over the counter edge, not the middle of the floor, so you are not working in your own shadow.
• Puja room: a narrow-beam tiltable spot such as ROLEX aimed at the idol, in warm white. Our guide to the best spotlight for a pooja room explains the angles.
• Shops and showrooms: zoom and tiltable spots that can be re-aimed as displays change during the festive season.

How Many Downlights Do You Need?

A practical rule is to space general-purpose downlights at roughly half the ceiling height. For a typical 9 ft finished false ceiling, that means about 4 to 4.5 ft between lights and about 2 ft from the walls. In a 10 x 12 ft bedroom, that usually works out to four to six downlights of 7W to 12W.

Darker floors, high ceilings and rooms used for reading need more light, while a room that also has a profile cove can use fewer downlights. For a room-by-room plan, bring your ceiling drawing to our Esplanade East showroom.

COB Light Price: What You Will Pay and Why

Price depends on the model, wattage, finish and colour option you choose. The current price of each model, including any running offer, is shown on its product page. For a full breakdown, see our LED COB light price guide.

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

• Wattage. Higher output costs more. DEEP COB, for example, costs more at 12W and 18W than at 7W.
• 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.

Upgrading Your Ceiling Before the Festive Season

Diwali, Kali Puja and the wedding season are when most families in Kolkata finish their false ceilings and host guests. Replacing old CFL or round SMD fittings with anti-glare COB downlights is one of the quickest upgrades: the cut-outs often stay the same, and the room looks newer the moment the lights come on.

For the festive decoration that goes with them, see our LED strip and rope lights for Diwali.

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.

Buy COB Downlights in Kolkata

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, visit our Esplanade East showroom to see the fittings switched on and discuss quantities.

You can also plan downlights alongside our LED profile lights so the whole ceiling works together.

Diamond Electrical Industries has been part of Kolkata's lighting trade since 1958.