Please explain watts and brightness in LED bulbs

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Can someone explain to me the difference between watts in the old sense and the new 7w = 60 watts on new bulbs


How can one bulb say 7w=60 watts and another say 8.5 watts = 60 watts?


Can this bulb 7w LEd but no = wattage. It is 460 lumen


https://www.eew.ie/products/7w-led-e27-gls-dusk-till-dawn-lamp-inl-21524.html?filter_set


go in to this https://www.woodies.ie/lighting-lightbulbs/indoor-lighting/lamps-shades/floor-lamps/split-stem-floor-lamp-black-1154392 where it says max 42 watt


I looked at lumen to watt calculators and they say different things


Does max wattage refer to the fittingin the ceiling or lamp or to the shade. i ave seen this max on the shade too

anacc

Lumen is how bright the bulb is so that's what you use to compare brightness of different bulbs.

Wattage is how power the bulb uses. Different LED bulbs will have different efficiencies so bulbs of different manufacturers and models will have different lumen values even if they're the same wattage.

The "max" wattage on a fixture is the maximum wattage that fixture is capable of safely handling. Generally it refers to incandesant bulbs which are higher wattage than LED bulbs.

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anacc wrote: »

Lumen is how bright the bulb is so that's what you use to compare brightness of different bulbs.

Wattage is how power the bulb uses. Different LED bulbs will have different efficiencies so bulbs of different manufacturers and models will have different lumen values even if they're the same wattage.

The "max" wattage on a fixture is the maximum wattage that fixture is capable of safely handling. Generally it refers to incandesant bulbs which are higher wattage than LED bulbs.

Do you know if my 7 watt will be ok in that lamp?

FishOnABike

Wattage is the enegry consumption of the bulb.

A traditional incandescent bulb is relatively inefficient in converting the energy used into light and generates a lot of heat to produce a particular light output.

The light output is measured in lumens.

When a LED bulb shows an equivalent rating like 7W = 60W (or 8.5W = 60W) it is indicating that the LED bulb has the same light output as a 60W incandescent bulb.

The 7W LED bulb is slightly more efficient than the 8.5W LED bulb and very much more efficient than the equivalent 40W incandescent bulb for the same light output.

The following article gives a good explanation https://www.which.co.uk/reviews/light-bulbs/article/five-tips-for-choosing-the-right-light-bulb

FishOnABike

Phoenix Immense Oak wrote: »

Do you know if my 7 watt will be ok in that lamp?

A 7W LED buld will draw far less current and run a lot cooler than a 40W incandescent bulb. There should be no problem using a 7W LED bulb in a 40W rated lamp.



Some LED bulbs have a noticable solid base just above the connector which can give a different light pattern or cause some shadow compared to an incandescent light but there are LED bulbs without this and with a filament like LED strip that are very like incandescent lights in their light pattern.

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FishOnABike wrote: »

A 7W LED buld will draw far less current and run a lot cooler than a 40W incandescent bulb. There should be no problem using a 7W LED bulb in a 40W rated lamp.



Some LED bulbs have a noticable solid base just above the connector which can give a different light pattern or cause some shadow compared to an incandescent light but there are LED bulbs without this and with a filament like LED strip that are very like incandescent lights in their light pattern.

is 40 watt the same as 42 in terms of using the bulb .Just noticed on the link it says my bulb is 9 w but the box 7w

anacc

Phoenix Immense Oak wrote: »

Do you know if my 7 watt will be ok in that lamp?

Yes it'll work fine unless the lamp is dimmable and the LED bulb isn't dimmable.

anacc

Phoenix Immense Oak wrote: »

is 40 watt the same as 42 in terms of using the bulb .Just noticed on the link it says my bulb is 9 w but the box 7w

A 9w or 7w bulb will be absolutely fine in a fixture rated for 40/42w.

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anacc wrote: »

Yes it'll work fine unless the lamp is dimmable and the LED bulb isn't dimmable.

thanks