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Question about Grow Light and Wattage. Blipstir 10/13/23 10:24 PM
. * * Re: Question about Grow Light and Wattage. Kryptos   10/15/23 12:09 AM
. * * Re: Question about Grow Light and Wattage. koraks   10/15/23 01:05 PM
. * * Re: Question about Grow Light and Wattage. Kryptos   10/15/23 01:47 PM
Invisiblekoraks



Reged: 06/02/03
Posts: 26667
Re: Question about Grow Light and Wattage.
      10/16/23 03:11 AM

Quote:

Kryptos said:
Quote:

koraks said:
So there's really no quick & dirty way to equate X Watts of LED power to Y Watts of some other form of lighting.




I mean...Watts is the "quick and dirty" way--because Watts can be used to measure the electromagnetic flux coming off a bulb.



I see what I mean, but I think the issue here is that Watts are used inconsistently, and deliberately so. They're used as a way to express electrical power supplied to and dissipated by the LED or the incandescent bulb, and at the same time as a (very gross) approximation of the luminous flux emitted by the LED source. Since Watt is basically a unit that expresses an amount of energy per unit of time, it's a really flexible measure to use - but that also makes interpretations specific to contextual factors. Especially for consumers, this makes the whole thing kind of convoluted and confusing. Sadly, there's no good solution to it!

Quote:

To go back to my example of incandescent vs. LED bulb--filament are extremely efficient at converting electrical power to blackbody radiation, which is also a form of power. But it's very non-specific. So, 60W incandescent is giving off like, 50W IR and lower energy flux, 9W visible flux, and maybe 1W high energy wavelength flux. A 60W "equivalent" LED consumes 9W electricity and gives off 9W visible flux.



Yeah, in principle at least. Although LEDs aren't quite that efficient. For most high power LEDs, the efficiency is maybe 50% or so AFAIK; the rest is still dissipated as heat in the semiconductor junction itself.

Quote:


(pretty sure we're saying the same thing in various ways with varying amounts of detail, but that's okay because this discussion is meant to...illuminate...the subject for anybody that's passing by with a question!)



Sure; this discussion is not so much about disagreement but more about elaborating a couple of key points.

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