How much heat does a 40 watt light bulb give off?

Question

I have a clear, 40 watt G23 light bulb and I was just wondering how much heat in fahrenheit it gives off! I want to paint the light fixture, but I don't want to start a house fire so I'd really like to know how much heat the light bulb gives off so that I know if I can paint the light fixture or not!

Answer 1

Heat is an important factor in determining a light bulb's energy efficiency. Heat produced is energy wasted. It's also a potential fire hazard. Cooler light bulbs are the smarter choice.



Incandescent Lights

1. An incandescent light bulb consists of a wire filament inside a glass bulb. When electrical current flows into the wire filament, it heats up until it glows.

Incandescent Heat

2. Only about 10 percent of the energy powering an incandescent bulb actually converts to light. The other 90 percent just heats up the area around the bulb.

Fluorescent Lights

3. Fluorescent light tubes contain argon gas and mercury vapor, and are coated inside with phosphor. Electric current causes the gas to produce ultraviolet light, which in turn makes the phosphor coating glow.

Fluorescent Efficiency

4. Only about 30 percent of the energy powering a fluorescent light is wasted in heat. The other 70 percent goes directly toward creating light.

Risk of Fire

5. An incandescent light bulb can reach a temperature of 572 degrees Fahrenheit, more than sufficient to ignite wool, cotton or paper. A compact fluorescent light operates at only 90 degrees Fahrenheit.

Proximity to Plants

6. You can place a fluorescent grow lamp close to your plants without worrying about burning the leaves.

Answer 2

100- 103 degrees f. I hate how you can t get a direct answer for a direct question without people trying to prove how smart they are. The question is how much heat does a fluorescent bulb put off. I took my digital thermometer and pointed at a 48 inch bulb, 32 watts and got 100-103F.

Answer 3

What it potential is which you ought to draw no greater beneficial than 40 watts from that lamp. you ought to use something as long because it does not exceed 40 watts. contained concerning a CFL bulb, you could placed a 30 watt CFL bulb in there and almost blind your self without exceeding the lamps risk-free practices score. what's even nicer interior the summertime is that the bulbs do no longer generate almost as lots warmth.

Answer 4

Heat is not measured in Fahrenheit. Heat is measured in Joules, and rate of heat transfer is measured in Watts.



40 Watts is how much heat it gives off...it is all heat, all gray body radiation heat transfer. You only think about 10% of it is light, because it is hot enough to emit some radiation in the visible spectrum.

Answer 5

other answer is correct, heat is not measured in fahrenheit (or celsius), that is how you measure temperature.



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.



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