Of course, in today’s world, we are all being encouraged to discard those ancient incandescent bulbs for the new compact fluorescent lamps (CFL) and light emitting diodes (LED), which for most of us seem really expensive to buy. I admit that I never really liked the traditional tube fluorescent lights, probably because first, I always have trouble getting the bulbs in - it seems that I always have them out of alignment and second, I usually buy cheap lights that have ballasts that go bad. But I must admit, now that I’ve started using the screw in CFLs (like the one pictured), I’ve had quite a change of heart. I’ve yet to take the plunge into the world of LEDs however, primarily because I haven’t yet been able to justify the expense. And for me, they always seem to look blue. Nonetheless, I know that someday I will make the switch as they all will become clear with the obligatory advancement of technology.Recently I set out to compare our friends, the CFL and the classic incandescent. The following two tables illustrate the characteristics for a range of incandescent bulbs from 25 watts to 200 watts and a range of CFLs from 5 to 40 watts. Assuming you turned on each light and left it on for a full year, how much would it cost, including bulb replacement and electricity?
Incandescent (5,000 hour life)
CFL (10,000 hour life)
As you can see, the lumens per watt increases as wattage increases for both types of bulbs. In addition, notice that the lumens per watt or luminous efficacy value is 6 to 8 times greater for CFLs than their incandescent brethren and they last twice as long. As such, even though a CFL costs 5 to 6 times more than an incandescent bulb in the store, the loaded cost per year of a CFL is still about 20% of an equivalent incandescent.
Of course that looks good on paper (or on a screen), but what does it mean in real life? In 2008 my house had about 90 incandescent lights totaling 6750 watts. At a 6% duty cycle, I used a total of 3,544 kWh on lights at a cost of about $373 (don’t ask me how I know this - just accept the fact that we engineers like data). Anyway, these 6,750 watts put out about 61,875 lumens. Using the equivalent light in CFLs, I figure I would need only about 955 watts of CFLs to get the same light. At the same duty cycle this would be only 501 kWh at a cost of $53 - an annual savings of $320. Note that replacing all 90 bulbs at $3 each would cost only $270. I think I had better get started.
Truchard will be presented the award at the 2014 Golden Mousetrap Awards ceremony during the co-located events Pacific Design & Manufacturing, MD&M West, WestPack, PLASTEC West, Electronics West, ATX West, and AeroCon.
Robots that walk have come a long way from simple barebones walking machines or pairs of legs without an upper body and head. Much of the research these days focuses on making more humanoid robots. But they are not all created equal.
The IEEE Computer Society has named the top 10 trends for 2014. You can expect the convergence of cloud computing and mobile devices, advances in health care data and devices, as well as privacy issues in social media to make the headlines. And 3D printing came out of nowhere to make a big splash.
For industrial control applications, or even a simple assembly line, that machine can go almost 24/7 without a break. But what happens when the task is a little more complex? That’s where the “smart” machine would come in. The smart machine is one that has some simple (or complex in some cases) processing capability to be able to adapt to changing conditions. Such machines are suited for a host of applications, including automotive, aerospace, defense, medical, computers and electronics, telecommunications, consumer goods, and so on. This discussion will examine what’s possible with smart machines, and what tradeoffs need to be made to implement such a solution.