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# Why is a 5 watt bulb brighter than a 25 watt bulb?

Updated: 9/23/2023

Wiki User

10y ago

It depends on the type of bulb. Incandescent bulbs convert about 90% of the energy into heat and and only 10% is put off as light. LEDs, for instance, are much more efficient, converting almost 90% of the input energy to light. So, a 5 watt LED will convert about 4.5 watts to light, while a 25 watt incandescent will only convert 2.5 watts into light.

Wiki User

10y ago

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Q: Why is a 5 watt bulb brighter than a 25 watt bulb?
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### Why is a 100 watt bulb brighter than a 25 watt bulb?

Because it takes more current and power and produces more light power. Running a 100 w lamp costs 4 times more than a 25 w lamp.

### Which is brighter 10 watts or 25 watts bulb?

That depends on so much more then just the watt of the bulb, but if you have two identical bulbs where the only difference is the amount of watt, then logic dictates that 25watt is brighter then 10watt

### Why does a 25 watt bulb glow brighter than 60 watt in a series circuit?

Because the filament of a 25-W lamp has a higher resistance than that of a 60-W lamp and, therefore, will experience a greater voltage drop -the lamp with the voltage drop closer to its rated voltage (in this case, the 25-W lamp) will be the brighter.

### Why does a 100-watt lamp glow brighter than a 25-watt lamp?

because it has more watts

yes, 4x more

### Will a 25 watt light bulb effect a plant's growth?

Yes, if the bulb is incandescent, and you change from a higher wattage bulb to a 25 watt bulb the future growth will be smaller.

### Do 100-watt light bulb use energy 4 times as fast as does a 25-watt bulb?

Yes, that is what the numbers mean.

### How bright is 70 lumens?

A little bit less than a 25 watt incandescent bulb - the the table below:Bulb brightnessA 100 watt Bulb is rated at approximately 1700 lumensA 60 watt incandescent bulb is rated at approximately 800 lumensA 40 watt bulb is rated at approximately 400 lumensA 25 watt bulb is rated at approximately 180 lumensA 4 watt night light bulb is rated at approximately 20 lumens

### What size light bulb is in a deep freezer?

Mine has a 25 watt 120 volt bulb in it.

### Does a 25 watt light bulb draw more current than a 60 watt light bulb?

No, a higher wattage INCANDESCENT light bulb uses more current than a lower wattage INCANDESCENT light bulb. Some CF and LED bulbs are rated by the amount of light that an incandescent bulb would produce, but they are also rated by the wattage that they use.

### How bright is 300?

About what you would see from a 25 watt light bulb.

### How may watts is 400 lumens?

Bulb brightness in LumensA 100 watt Bulb is rated at approximately 1700 lumensA 60 watt incandescent bulb is rated at approximately 800 lumensA 40 watt bulb is rated at approximately 400 lumensA 25 watt bulb is rated at approximately 180 lumensA 4 watt night light bulb is rated at approximately 20 lumens