have the right to You Really recognize The exactly Lumen Output?

Lumen outputs have the right to vary per 4’ fluorescent bulb depending upon the type, wattage and also manufacture. In truth though, most world are trying to find a cheap $2.50 bulb or even less.

You are watching: How many lumens in a 8 foot fluorescent bulb

Average early “new” lumens (out the the package) for a 32 watt pear at 3500k color temperature is 2850.


For 2’ bulbs in ~ 17 watts and also 3500k, you would gain 1300 lumens.

With the said, the answers room misleading depending on which fluorescent pear or fixture to produce you’re talking too.


Are all Bulbs made To The same Lumen Output?

No, unfortunately they room not all the same....wouldn"t that be nice?

The quantity of light created by 32-watt T8 fluorescent lamps varies substantially from one lamp model to the next and from one manufacturer to another.


Figure 1 shows the selection of values for rated early light output that room presently published for 121 lamp models by ripe manufacturers for various correlated color temperatures (CCT).

The number of available models because that each rated early light output is stood for by the dimension of the bubble. As you have the right to see, the values are everywhere the place.


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Here’s The Catch…..What Is The True Output and also Where Does that Light Go?

The fluorescent lamp is an omni-directional light source, shooting irradiate in every direction, and only 1/3 of the light directly lights the intended surface. If the pipe is placed in a troffer and also even larger portion is reflected within the fixture and really never ever leaves it.

LED is a directional irradiate source. The lumen calculation is measured exterior the fixture or as soon as the light in reality exits the fixture. The usable light that is directed in the direction of it’s intended surface ar vs. Scattered and also lost native the fluorescent source.


Other components That add To Lumen Depreciation

Factor other lovely characteristics of Tesla’s innovation that GE commercialized in the 1940’s such together 30-60% lumen depreciation from the fluorescent resource (40% typical light loss end it’s chuck 8,000 hour life), fixture dirt/dust depreciation determinants of .9 or greater, 30% optical losses indigenous fixture diffusers, lenses, etc., low ballast factors, etc. And also the fluorescent lighting system on typical produces 35% of the original total bulb lumen output on a good day.

For example:


2850 lumens per bulb netting 11,400 lumens. Variable in the real civilization lumen "robbers" indigenous above, and also you probably see 7,410 lumens from that device on job 1.

Day 120- In a usual retail setting we could see 5,000 lumens. In various other words when you put up a LED fixture such as a 45w 2"x2" versus a 3 pear T8 fluorescent 2"x4", the LED will certainly win every time.....and use a LED 74w 2"x2" up against 4 lamp fluorescent solution all day and win.

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Can friend Really regulate The irradiate Pattern created By A T8 Fluorescent?

No, that"s practically impossible.

The irradiate pattern created by a fluorescent fixture is an absolute mess come optically control. This consequently requires many much more fluorescent fixtures in a usual lighting applications to attain the very same lighting levels the you can get with the optically regulated LED fixture. That"s among the big reasons human being are moving to LED.


With the fantastic optical manage of a LED, you gain much an ext uniform lighted environment, PLUS lower wattage, plus much longer life.

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