Monday, April 15, 2024

Daylight Harvesting With Automatic Lighting

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Sekhar Nori has come up with a product he calls the Day360 Integrated Daylight System (IDS). This is a lighting system that harvests daylight to provide free lighting during the day and electrical lighting at night. It is controlled automatically by the system but has a manual override option for those special occasions.

Sekhar Nori says, “During my former experience with the solar energy field, where I worked with solar conversion, I found that the conversion ratio of solar energy is comparatively depressed. This caused the system costs to be relatively high. This is when we recognized that it is time to convey the visual solar energy as light itself.”

Daylight Harvesting With Automatic Lighting

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In this system, you do not convert daylight into any other form of energy like heat or electricity. This helps increase the product’s life, the product becomes more affordable which, in turn, increases the return on investment.

What it is?

It is a concept where both natural daylight and electrical lighting are integrated into a single and simple platform. Depending on the availability of daylight, the electrical lighting system switches on or off to complement the light in the area.

Although the Day360 IDS was deduced from the idea of Lightpipe (a solar daylight system), it is a completely new solution with a daylight system being just a part of it. The IDS makes use of electrical lighting, daylighting, light sensors, and a lighting controller for an all-in-one system that even has smart meter functionality.

Sekhar says, “We did a lot of R&D for IDS for about one-and-a-half years. This year we finally finished its design and fabrication. IDS is a completely new way of providing an automatic lighting solution for commercial buildings.”

How Does it Work?

The daylight system part of IDS has a light collector, a reflective system, and light diffusers. The light collector collects sunlight and the reflective system transports this light just like an optical fiber. The light diffusers take the light out of the tube and diffuse it into the building.

Lighting controllers: The lighting controllers take care of the entire working of the IDS and also help in switching between daylight and electrical lighting. The lighting controller has three parts—daylight sensing, a control system, and a central control panel.

Sekhar says, “The light sensing element used by IDS is a special light sensor built by us. This is an open-loop light sensor. Normally the light sensor used in a building works in a closed loop. The light sensor that we build gives continuous feedback to the lighting controller. In an open loop sensor, the light is measured from the ambient sky and never measured in the task plane. Whereas in closed loop sensor light is continuously measured at the task pane (a task pane could be either floor level or any other plane) and is given as a feedback to the controller.”

The light sensor continuously measures the ambient sunlight. If the ambient sunlight is less than the desired light intensity required in the room, the lighting controller turns on the electrical lighting. The electrical lighting is divided into three groups, each representing a step for switching on or off. Depending upon the light intensity, the controller turns on the required number of steps in electric lighting. Nori adds, “The lighting controls and the central control panels are also built in-house. All lighting systems can be controlled through central control panels.”

Monitor and control energy: The control system monitors the energy consumed and the savings on the lighting system like a smart meter. It also allows the manual override of the system and monitors failures and data inputs.

Sekhar explains that the main technology behind IDS is the response of electrical lighting to the available daylight. He adds, “In this system, we have built a couple of other features too, like the smart metering of energy consumption. The energy consumption of the electric lighting system is continuously measured, metered, and displayed in a control panel. So the utility managers or the facility managers can actually monitor the power consumption of the lighting systems and track the energy savings they are able to make, and then they can also convert it to carbon credits.”

To Convince is a Challenge

Sekhar says, “We are not used to the concept of daylighting but are used to electrical lighting. The buildings too are built in such a way that there is no methodology to use daylight. So people stay connected to the electrical lighting without considering the use of daylighting. Our challenge here is to convince people that we have a methodology to use this daylighting.

“We are trying to make a change in the concept of building design and show that daylighting can be an integrated part of the building and devices can be built for effective use of that. In the last 4-5 years we have made a large impact by doing so many projects across the country (based on previous Lightpipe technology).”


Daylighting is extremely good in terms of the psychological and physiological benefits it delivers. Lots of research and studies conducted on lighting prove that it is a great psychological uplift when the building is day-lit. It improves the mood of the people and enhances productivity.

The use of a daylighting system adds to the energy savings of the building by using sunlight as a renewable energy source. It also increases the energy efficiency of a building and a reduction in its carbon footprint.

Market Strategy

Launched only in April, Day360 IDS targets large factories, commercial stores, warehouses, etc. Nori says, “We are presently looking at the South Asian and Middle Asian markets for IDS because there is ample sunlight available here. The South Asian neighborhood is also an energy-deficit region, which is not the case in the Middle East. We assume IDS to be fit for this market and can be used extensively here. The energy-saving benefits are very promising in these areas.”

Sekhar proudly shares, “Day360 IDS is the first of its kind in the world and does not take in any competitors yet. We have filed for patents for this product.”

Also Read: How Architecture is Becoming Intelligent?

The author is a technology journalist at EFY


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