Watts to lumens calculator

Anyone thinking of going with LED lights might find this site useful.

Watts to lumens calculator

Click on the above link.

Re: Watts to lumens calculator

that calculator does not work. go with specs. they don't lie.

my 5w led headlight is 800lm.

Re: Watts to lumens calculator

> el pollo Wrote:

> -------------------------------------------------------

> that calculator does not work. go with specs. they don't lie.

>

> my 5w led headlight is 800lm.

What you are stating is that your leds have 800lm of brightness or light and consume 5 watts of power. Different leds of the same lm or brightness may or may not use more power. So ya, trying to convert between the two really is usless because not all leds are created equal...

Unless one is trying to compare the brightness of an led to an existing conventionals brightness. (edited)

Re: Watts to lumens calculator

no, what I've always said is that parts are ordered by spec. electronics always gets cheaper and better.

Re: Watts to lumens calculator

Dirty30 Dillon /
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Wattage is a measurement of consumption, lumens are a measurement of the light energy emitted by the source.

In reality, all these cheap LED's are going to have great lumen output but without proper optics and reflector your lux/footcandle measurements are going to be shit anyways. The big problem is that most inexpensive LED's don't come in an optic assembly worth a damn, or at all, and the retrofits that are used in traditional housings actually lose lux output due to poorly shaped beam and flood loss out the front.

Re: Watts to lumens calculator

led bulbs do not come with a reflector. more nonsense.

Re: Watts to lumens calculator

Dirty30 Dillon /

> el pollo Wrote:

> -------------------------------------------------------

> led bulbs do not come with a reflector. more nonsense.

Do you read anything? That's what I'm fucking saying, you nincompoop.

Of course auto retrofit bulbs don't come with the reflector, that's the point, they are a ReTrOfIt.

On the other hand, every LED lightsource has a reflector and/or optic to properly shape and focus the beam. Even giant LED softlites have reflectors and optics.

Re: Watts to lumens calculator

this thread is about a calculator that does not work.

leds are not retrofit. they are modern replacements in standard sizes.

Re: Watts to lumens calculator

Dirty30 Dillon /

> el pollo Wrote:

> -------------------------------------------------------

> this thread is about a calculator that does not work.

>

> leds are not retrofit. they are modern replacements in standard sizes.

Capture.PNG

You are wrong. LED bulbs are made to retrofit housings originally intended for use with incandescent bulbs.

And again, the calculator works just fine. The wattage of an LED array does not concretely correlate to a lumen output, as the luminous efficacy rating will determine how much of the power consumption (wattage) is effectively turned to light (lumen) considering the loss of energy through heat, etc.

Re: Watts to lumens calculator

physics helps. electronic parts always get better cheaper with time. how can a calculator calculate the physics of a part. it cant work.

order parts by spec. always look for the highest specs lowest price. there is a lot of junk on ebay.

Re: Watts to lumens calculator

Does everything here have to turn into a he said she said bickering? I think a bunch of people here need to get a life.

Re: Watts to lumens calculator

Dirty30 Dillon /

> el pollo Wrote:

> -------------------------------------------------------

> physics helps. electronic parts always get better cheaper with time.

> how can a calculator calculate the physics of a part. it cant work.

It specifically can because how do you think the manufacturers get the specs? They aren't setting up and spectrographing every LED. They know that a 5W LED with X efficiency will produce X lumens. That's literally a lighting engineers job. Lumen is a rating of the light energy produced. as such, an LED is simply a transformer/engine that changes an input power into an output power. the loss or gain is determined by the efficiency of said transformer/engine.

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