4 ft. LED shop light - Page 3 - Router Forums
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post #21 of 27 (permalink) Old 11-08-2019, 11:29 AM
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LEDs certainly offer many improvements over antiquated illuminaton. Some comments, since I have worked in the architectural commercial fixture business since before LEDs became relevant:

The best fixtures utilize dedicated ballasts and light sources combined, called light engines - best performance, lifespan and light quality when compared to retrofit integrated bulbs.

The costs of all LED sources has tumbled and now matches flourescent in most cases.

For best illumination, daylight 6500 Kelvin temp is what you want, not below 4000, which becomes too orange. I run moslty 6500 T8 in the garage, but am slowly adding LEDs and replacing as they die off.

CRI should be above 80, current Title 24 compliant fixtures are in excess of 94 IIRC.

100 or 105 lumens per watt is pretty much a standard now, so all LED fixtures will offer amazing efficiency, even the least expensive stuff out there.

Diffusing/blending the output results in better spread and lower hot spots/eye strain if the chips are visible - lots of designers have insisted on this type of output - much easier to achieve with the higher efficiencies.
This means playing with angling the fixtures for reflecting the output and considering matte white walls, ceilings and light coloured floor coverings when possible. Maximize and direct the light you have. LEDs are directional, which is both a blessing and a curse, depending on application and fixture type.

Heat is the enemy, this is why most retrofit lamps will not last anywhere near the typical 50-100 000 hours; we still manufacture plenty of fixtures that accept those - typically about half the output and 1/5-1/10 the lifespan.

Too much light is better than not enough, consistent, even illumination is paramount, especially for us senior citizens - when there is plenty of light, our eyes reduce the retina opening (like a F16 stop on 35mm camera lens) for way better depth of field and focus. The HF $20 fixtures are an amazing value - I bought a few but haven't installed them yet - they are 4000k IIRC, likely 75 CRI or so. we manufacture some linear fixtures that produce 2800 lumens per foot out of a 2"x4" extrusion - app 50/50 up and down. The number one inquiry from the market is - can you dim them down lol.

Fun Facts: 5000k blueish hue is used in high end car detailing shops to magnify the flaws in the paint finish. Sunlight is near 6500k depending on location, weather and time of day/ year, since the atmosphere affects colour - think sunset vs sunrise etc.
Tunable color is coming - from warm to daylight for increased productivity and attention span in schools. Philips in Europe started researching and participating in this about 10 years ago; now some high end spaces have sensors that match the interior lighting colour index with the actual outdoor ambient lighting for perfect blend and not influencing the human circadian rhythm.

I have no knowledge of the blue UV issue mentioned, but I'm sure it's a thing. Human Eye fatigue exists with LEDs for sure, as with all artificial illumination.


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Last edited by tulowd; 11-08-2019 at 11:35 AM.
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post #22 of 27 (permalink) Old 11-08-2019, 05:15 PM
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Well this is certainly interesting. I’ve gotta get me some of this tape

https://www.downtoearth.org.in/news/...solution-58544

Quote :
Mani and his team tested most of the commercially available LED luminaire with a spectroradiometer and found the blue peak to be unnaturally high and very unlike the natural indoor light. Finally, through some quirk of intuition, Mani tested the lights after applying Kapton tape, a polyimide film that can remain stable across a wide range of temperatures. "To everyone’s delight, it did the job so well that one would even be convinced that these tapes were developed only to cut the blue peak. So much so, that our lab has all our LED lights with Kapton, and everyone who visits our lab feels that these lights feel good," says Mani.

In light of the harmful effects of these radiations, many manufacturers are taking a serious note of blue peaks from LEDs and are moving towards warmer LEDs without the blue peaks. Most warm LED lights, 4,000 K and even 2,700 K, still emit an uneasy blue peak, but are much subdued from the cool daylight 6,000 K variants.

Experts recommend the blocking of blue light in the 415-455 nanometres (nm) spectrum in LED lighting for commercial use. Experimental evidence indicates that exposure to blue light in the range of 470–490 nm may be less damaging to the eye compared to blue light in the 400–460 nm range. Experts say that the development of LEDs with a peak emission of around 470–490 nm may represent an important advancement in the safety of LEDs for ocular health.

I donít always insulate , but when I do .
Ok ,I never insulate

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post #23 of 27 (permalink) Old 11-09-2019, 03:21 AM
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Nouvir Lighting - News
Check out this link

This is my biggest concern with white led lighting , the UV. The manufacturers are telling us theirs no UV , which may be total bs apparently.
Sure theirs hardly any UV in the UVA region , just below the human range of vision.
But UVC is being outputted as much as the output of it’s blue peak according to this article . I really believe it’s the UVC that’s effecting my diseased eye ,as no other light source causes an issue .
UVC is a known eye irritant , and used to disinfect water .

Quote:

The photo above shows a UVX Radiometer using a 200nm-300nm head (UVB and UVC) in the actual testing of a major brand "white" LED luminaire. The meter shows a UV output of 3.8"W/cm2 for their "cool white" LEDS. The spectral power distribution from the manufacturer's website shows peak output for this LED to be roughly the same intensity, 3.7"W/ cm2. Their "warm white" LEDs show even worse results, a peak output of 1.9"W/cm2 and a short wave UV output of 2.9"W/cm2. The bottom line is that these fixtures put out as much UV as they do blue light .

I donít always insulate , but when I do .
Ok ,I never insulate

Last edited by RainMan 2.0; 11-09-2019 at 03:27 AM.
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post #24 of 27 (permalink) Old 11-10-2019, 07:40 PM
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Quote:
Originally Posted by kp91 View Post
I tripled the number of fixtures in the shop (mine came from Costco) since they don't draw anything, looks like daylight now. If you add the cheap little HF remote control, you can turn them on in sections as well.

https://www.harborfreight.com/indoor...-pc-62575.html
Mine came from Costco as well, and paid $30 a pc for them. Ken bought me four (4) of them. I love the remote.
kp91 and Herb Stoops like this.

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post #25 of 27 (permalink) Old 11-10-2019, 08:39 PM
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These came in a week early.
The fixtures are made of plastic and the bulbs are defused.
Give me a week, or month, or year and I will get them installed and let you know how they are.

KC
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"I swear! I cut it three times and it is still too short!"

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post #26 of 27 (permalink) Old 11-11-2019, 08:54 AM
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I have nothing but LED's in my new shop. Bought them all from Sam's. I have 8 of the 4 foot ones for over head lighting and 2 more 4 foot above the 12 foot work bench. It's super bright and no dark shadows anywhere!

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post #27 of 27 (permalink) Old 11-13-2019, 10:48 AM
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Quote:
Originally Posted by LexAdmn View Post
These came in a week early.
The fixtures are made of plastic and the bulbs are defused.
Give me a week, or month, or year and I will get them installed and let you know how they are.

KC
I did replace 4 of existing fixtures and these are certainly brighter.
I have no way or knowledge of measuring the difference, but I would not go so far as to say they are grossly brighter than the replaced fluorescent lights, however easily noticeable.
They are 4000K. A little warmth in color, but nice and bright.
I do notice a slight delay from the time I flip the switch, until the lights come on. A fraction of a second?
I do not see this adversely affecting anything, yet.
Will see how well they hold up but, pretty happy with the price, install, and performance so far.

KC

"I swear! I cut it three times and it is still too short!"

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