Light bulb color temperature chart

Light bulb heat temperature wireless color temperature changing double color smart led light bulb heat. Light bulb heat temperature developed a conjugate heat transfer finite element model of an led bulb and surrounding air in an enclosed recessed lighting fixture.

Measuring The Heat Output of Different Lamps

This experiment was intended to measure the way in which different “types” of lamps of the same wattage produce drastically different basking temperatures.


One of the basic laws of physics is the law of the Conservation of Energy. This simply states that energy cannot be created or destroyed, it can only be transferred from one form to another.

So when a 100watt lamp is switched on, 100 watts of electrical energy is converted to 100watts of light and heat; a 50watt lamp produces a total 50 watts of light and heat, and so on.* However, some lamps are more efficient at producing light than others; this determines how much of that 100 watts is transformed into light, and how much is “wasted” and comes out as heat (very useful, though, if what we want is a basking lamp).

An incandescent lamp is an extremely inefficient light source. According to the Wikipedia online encyclopaedia, a 100 watt bulb is 2.1% efficient. In other words, it produces about 2 watts of light and 98 watts of heat.

A halogen lamp is a bit better. For every 100 watts you put in, you get about 3.5 watts of light and 96.5 watts of heat.

Fluorescent lamps are said to be about 8.2% efficient, and although there were no figures on Wikipedia for mercury vapour lamps, I found one reference saying they were about as efficient as fluorescent lamps, and another that said they were three times as efficient as incandescent lamps… so we’re looking at 6 – 8% efficiency here. 100 watts of electricity will be converted to, at most 8 watts of light (including UV light) and 92% will still come out as heat.

So the main factors which determine how much heat a lamp puts out, are what type of lamp it is, and its wattage.

However, the heat and light from a lamp can be emitted in all directions, or focused on a small area (consider the heat and light you might experience sitting 2ft below a 60 watt frosted “globe” lamp as opposed to a 60 watt narrow beam spot lamp) hence the shape of the lamp, the type of glass surface and the presence or absence of reflectors, such are found inside spot lamps, will also play a major part in determining how hot a basking spot gets directly under any lamp, of whatever wattage.

Light bulb heat output

How much heat is emitted by incandescent, halogen, and compact fluorescent light bulbs?

Incandescent light bulbs create light by heating a filament inside the bulb; the heat makes the filament white-hot, producing the light that you see. Halogen light bulbs create light through the same method. Because incandescent and halogen bulbs create light through heat, about 90% of the energy used is wasted to generate heat. To reduce the heat emitted by regular incandescent and halogen bulbs, use a lower watt bulb (like 60 watts instead of 100).

Fluorescent light bulbs use an entirely different method to create light. Both compact fluorescent light bulbs and fluorescent linear tubes only waste approximately 30% of their energy in heat, making them far cooler and more energy efficient than regular bulbs. Fluorescent light bulbs are an ideal choice whenever reducing heat or saving energy is important.

A lot of our customers like to touch and handle our bulbs a lot – at times when they otherwise wouldn’t for standard incandescent or CFL bulbs (don’t worry, we do the same too). So one of the popular questions we get is, “wow, your lightbulbs are hot. Is that okay?”

How hot are LED light bulbs?

Hot to the touch, but not nearly as hot as Incandescent, Halogen and CFL bulbs are. LED light bulbs are one of the latest and most efficient lighting technologies. High powered lighting LEDs generate light at a much lower running temperatures than the hot filament used in previous generation bulbs. The hottest outside surface of an LED light bulb is often half the temperature of an equivalent brightness Incandescent or Halogen bulb, and around 20% cooler than CFL bulbs.

Should I touch my LED light bulb when it’s on?

LED light bulbs should be handled by the diffuser – the plastic dome that the light shines out of. When it’s lit or hot, don’t touch or handle LED light bulbs by the heat sink.Heat sinks on LED light bulbs are designed to get hot, drawing the heat out of the LEDs and transferring the heat into the air. It’s the hottest part of the bulb, and for good reason – the heat sink is designed to be the hottest part, while keeping the LED power supply and electronics as cool as possible.

Okay, but how ‘hot’ is hot?
In development and testing, we found that the heatsink of a fully lit LED bulb was around 60°C-100°C (140°F-212°F) depending on the make and model of the LED bulb, room temperature, and airflow. Here’s a thermal camera image analysis including some representative top brand-name samples of LED light bulbs – purchased new last week from the supermarket and hardware store. Brighter yellow is a higher temperature.

Heat produced from light bulbs

Because incandescent and halogen bulbs create light through heat, about 90% of the energy used is wasted to generate heat. To reduce the heat emitted by regular incandescent and halogen bulbs, use a lower watt bulb (like 60 watts instead of 100). Fluorescent light bulbs use an entirely different method to create light.

A key factor is to use materials with a high thermal conductivity to move heat away from the junction as quickly as possible. Unfortunately, some high thermal conductivity materials such as copper are also relatively expensive, and there is a trade-off between cost, performance, footprint, manufacturability and other factors.

Heat-spreading materials should be used that have high thermal conductivity both laterally (x and y directions) as well as vertically through the base of the device. Also, it is necessary to optimize the amount of LEDs versus the available surface area.

Which light bulbs produce the least heat?

LED bulbs fit standard light sockets and are the most energy-efficient light bulb option. They have lower wattage than incandescent bulbs, but emit the same light output. This allows them to produce the same amount of light, but use less energy. LEDs can last 20 plus years and do not contain mercury.

There are many different technologies that can be used literally every minute without us even noticing. One of the biggest breakthrough in our history was the introduction of the electric field.

Millions and millions of advancements and technologies were then introduced that uses electricity in its favor. However, one main product that we are mainly concerned about is the light bulbs.

Light bulbs are something that is available in almost every single commercial place in this world. The only way to light to the dark night sky is by using light bulbs. However, there are many different styles and variations of light bulbs which is where the innovation takes place.

Why Less Heat?

Yet, one concern that we care about when trying to pick the right light bulb for a certain application is the heat produced from the light bulb itself.

Given that energy is used in light bulbs, all the dissipated energy comes out in the form of heat which can be really effective to the surroundings around it in a harmful way.

There are two main reasons why heat loss from light bulbs is not something desired.

How much heat does a light bulb give off?

An incandescent bulb emits light through the heating of a small metallic coil called a filament surrounded by gases that heat to approximately 4000 F! While providing plenty of light, they release 90% of their energy as heat making them fairly inefficient in comparison to compact fluorescent lamp bulbs.

It gives off 40 watts of “heat”, but that won’t tell you if you can paint the fixture.

The only thing that would help is the temperature of the fixture, and that cannot be calculated, there is too much missing data, like shape, materials, air flow, etc.

What is the temperature of a 100 watt bulb?

A 100-watt incandescent light bulb has a filament temperature of approximately 4,600 degrees Fahrenheit. The surface temperature of incandescent light bulbs varies from 150 to more than 250 degrees, whereas compact fluorescent light bulbs have a surface temperature of 100 degrees Fahrenheit.

Compact fluorescent light bulbs typically last longer than incandescent bulbs and vary in color temperatures. Incandescence is a principle that results in the small production of light and a high production of heat. Although incandescent bulbs with higher wattage produce more light, they are not as efficient as fluorescent bulbs. A 20-watt CFL bulb can replace a 75-watt incandescent bulb in terms of light output.

For more details, contact us at email:

Leave a Reply