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Installing Shop Lights | Cypress Semiconductor

Installing Shop Lights

I have been involved with Cypress’s lighting products pretty much from the beginning, but there is nothing better than actually doing our own lighting project.  My new shop is 20’ by 23’ and I wanted at least 75 foot-candles (fc) of light. I went to this really cool website ( www.cooperlighting.com/iesCalculator/FlashIndoor.cfm?fp=/specfiles/ies/Metalux/SURFACE/WB/&fn=WB-432A.ies) and they recommended six, four 48” bulb fluorescent fixtures. Given normal wall, ceil and floor reflectance I have about 95 fc. I just had the floor epoxy coated and I am well over 100 fc. You don’t really get a feel for lumens, foot candles and such until you actually do a design, One thing I learned is with 24 bulbs, LEDs will have to get a heck of a lot cheaper before I could afford them. My cost including wire, conduit, fixtures and bulbs was about $500 for 67,200 lumens or about 3/4s of a penny per lumen.
 

Comments

ewertz's picture

Oh Dave, Dave, Dave,
With any luck you'll die in the next few years and can rest eternally knowing that you made the correct economic
choice for your lifetime. Whereas had you lived just a little longer you would have suffered deeply knowing
that you blew it, and would have been banished from TCO Heaven for all eternity.
Assuming just 6 hours of use a day, it's probably costing you about 2Kw-hr extra per day if you'd have gone
with LEDs that have twice the lumens/W over the FLs. If you've got room to spare for a 20x23' shop, I'm
guessing that your marginal kW-hr is probably close to $0.25-30, so that's at least $0.50/day to run the things.
That's $180/yr. Clearly ~40hrs/week is conservative because at $0.50/hr, time spent there is much cheaper that
a vacation away from your family, so you're pretty much going to be holed-up there during every non-Cypress hour.
Yeah, you'd probably have to spend $800 alone on the LEDs, and you've still got to pay for the wire and some
extra aluminum to exoxy all of those LEDs for heatsinking, too. But we know darn well that you're not paying
for PowerPSoCs (at the expense of the poor slob in the warehouse that gets fired for his inventory leakage
problem), so that's not even one of your fixed costs.
I'm sorry to hear that you've only got three years left -- but at least you can die knowing that you did
your TCO numbers correctly. You better hope that the doctor is right though, because any time you live
past three years is going to be awful for you. At least you'll be looking like death-warmed-over in that
miserable FL light.
You could always thwart life and throw yourself off the ladder while replacing the first set of bulbs to
burn-out. At least you planned ahead and epoxied the floor to make the cleanup easier. The real-estate
agent will almost certainly praise you for that during the eulogy.
Did you never once consider "What would TJ do?". Oh, ye of little faith!

xoxoxoxo,
-e

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