LED Shop Lighting

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NP317
Posts: 1446
Joined: Tue Jun 24, 2014 2:57 pm
Location: Northern Oregon

Re: LED Shop Lighting

Post by NP317 » Thu Feb 22, 2018 8:05 pm

seal killer wrote:
Thu Feb 22, 2018 11:51 am
All--

I cannot find LED tube lighting fixtures--those that come with the LED tubes permanently mounted--without a pigtail and 110v male plug. That means I would have to install a 110v outlet for each 8' fixture. I have an electrician friend that did exactly that. But, not being able to easily daisy chain those fixtures somehow bothers me. I will have three rows of four 8' fixtures in the garage. That means 12 outlets. If they are all dual outlets, that would also provide an additional 12 outlets up there for whatever. Not too handy, but maybe I could use them.

--Bill
The newer (2017>) COSTCO Feit 4' LED twin tube fixtures can be daisy-chained (5-ft long cord), and cost <$30. I just checked the two new spares I have to verify this.
I don't know the max number that can be chained together, but it is limited. At least 4, though.

Amazon has them too, but they're more expensive than COSTCO:
https://www.amazon.com/dp/B01LWIFY36/re ... 5448228312.

~RN

John Hasler
Posts: 968
Joined: Tue Dec 06, 2016 4:05 pm
Location: Elmwood, Wisconsin

Re: LED Shop Lighting

Post by John Hasler » Thu Feb 22, 2018 8:47 pm

wlw-19958 wrote:
Thu Feb 22, 2018 5:31 pm
Hi There,

How does this fit into spectroscopy (that is, the
analysis of an unknown compound through the
spectrum of the electromagnetic radiation of
the different wavelengths emitted when the
unknown is heated to the point they emit light)?

Good Luck!
-Blue Chips-
Webb
It's only that simple for gasses. The atoms get so hot that they lose their outer electons entirely in collisions. Then they get the electron back and emit a photon. The metals we are talking about aren't that hot. They glow because random thermal motion is accelerating the free electrons in random directions at random rates and electrons emit electromagnetic radiation when accelerated. However, the surface properties are such that some wavelengths are favored over others, depending on the metal. The hotter the metal gets the less this matters.

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wlw-19958
Posts: 1059
Joined: Fri Dec 22, 2006 5:41 pm
Location: Lewes, DE

Re: LED Shop Lighting

Post by wlw-19958 » Thu Feb 22, 2018 9:59 pm

Hi There,
John Hasler wrote:
Thu Feb 22, 2018 8:47 pm
It's only that simple for gasses. The atoms get so hot that they lose their outer electons entirely in collisions. Then they get the electron back and emit a photon. The metals we are talking about aren't that hot. They glow because random thermal motion is accelerating the free electrons in random directions at random rates and electrons emit electromagnetic radiation when accelerated. However, the surface properties are such that some wavelengths are favored over others, depending on the metal. The hotter the metal gets the less this matters.
That may well be but metals can be raised to a temp where
they emit EM radiation that is unique to the compounds contain
within.

Good Luck!
-Blue Chips-
Webb

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gwrdriver
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Location: Nashville Tennessee

Re: LED Shop Lighting

Post by gwrdriver » Fri Feb 23, 2018 9:30 am

I forgot to mention something in my previous post . . .

Over a long period of time, 20+ years in my case, the white reflective interior and plastic lenses of typical 2x4 fluorescent fixtures become dirty, most of which is (I assume) carbon from the bulb and ballast emissions. While I had everything taken apart I decided to clean as much of the deposits off as I could using various household cleaners. Virtually all of it came off and with only four fixtures to clean this added very little time and effort to the job.

I was astounded, first by the amount of dirt which was present and went unnoticed, especially on the lenses, but then by how much more light was reflected and transmitted. I reckon the amount of light was increased 15% by simply cleaning the fixtures. Well worth the time spent IMHO.
GWRdriver
Nashville TN

Inspector
Posts: 571
Joined: Mon Feb 23, 2009 4:25 am
Location: Saskatoon, SK, Canada

Re: LED Shop Lighting

Post by Inspector » Fri Feb 23, 2018 11:30 am

Bill my lights came with a cord to connect to the box, a pigtail to daisy chain it to the next and a connector to do the same. Mine were put up with the little connector. I have 4 lights in each row. Each row is 20' long and if I wanted I could have put a 5th light in the chain if I had the room. The cord would let you zig zag them or make a 90 degree turn at a corner. The limit with these lights is 200 watts total in a chain. If you need a longer connection wire order it when you get the lights. They are an extra buck or two each and they have lengths to a metre long, perhaps more, can't remember.

Pete
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