I recently moved into a lifelong dream dedicated shop. Using Ken's info, I designed the lighting program for the general shop and the separate finishing room. My general and electrical contractor folks were, at first speculative of "overdone", but when complete both were impressed with the result and cost effectiveness. I'm a very happy camper. THANKS Ken.
Thank Jack Lindsey the retired lighting engineer who wrote the article. All I did was help get the new, updated version published here at SMC. The credit goes to Jack.
I hate replacing light bulbs. One room in my current shop has 11 recessed lights, groan. Thus I like the idea of LED's. My temporary answer to the issue has been LED task lights:
Last edited by Mike Holbrook; 05-19-2016 at 4:06 PM.
Another thing that hasn't been discussed here is color accuracy. In lighting there is color temp and color accuracy. Most people easily pick out color temp. See the bright white daylight bulbs on some driveways at night and the neighbors have warm incandescent. Less obvious is color accuracy. You've probably noticed how cheap fluorescent bulbs make everything greenish. That's not color temp, it's color accuracy. Incandescent bulbs and sunlight have very consistent intensity across the color spectrum. Cheap fluorescent bulbs and most LEDs do not consistently light all colors.
I am an avid photographer and color balance is critical to pleasing photos. Super hard to do in reality. The lighting impacts it, the camera has inaccuracies, the computer display, and the printer. Photographers go to great lengths to calibrate and adjust for each step.
Here is a link to an article, there are many. https://www.cnet.com/news/shining-a-...cri-led-bulbs/
CRI is one measure of color accuracy but sadly the bulb makers, especially LED can game the test. They add different materials to the LED to change the colors. If you dig deeper you will find that LEDs have output peaks at the colors that are tested for CRI results. there is a movement to move to a new more stringent test. Also, the higher the CRI rating, the lower the efficiency, so accurate color comes at a cost from an energy perspective. http://indiecinemaacademy.com/comple...i-cqs-tm30-15/
I think color accuracy is important in the shop, especially for finishing. Just today I was spraying a clear (ish) finish on walnut. I am trying to match other furniture. I tinted Endurovar water based poly and in daylight the color is nearly a perfect match. In my shop I have 87 CRI fluorescent bulbs and the same two samples, original and new finish look very different with the new one looking slightly greenish. Unfortunately I'm not sure what lighting my friend will have where the makeup desk is going.
I have CREE High CRI LEDs by our chairs in our main room. They aren't too bad. Every year or so I try the latest high CRI LEDs for our landscape lighting and all so far look pretty greenish.
I am building a new shop and I will for sure be putting in the latest high CRI lighting.
Just found this link too. http://www.accessfixtures.com/color-rendering-index/
Last edited by Joe Jensen; 04-23-2017 at 12:56 AM.