The world LED-er (not!)

[unixronin]

Since we had a (standard incandescent) torchiere light short out internally and burn up its socket rather spectacularly last night, I went looking to see if there was an easy way to replace its guts with an LED solution.  And I found something very interesting.

Briefly, if you google for LED home lighting, you'll find that there's all kinds of LED home lighting devices on the market ... in Australia.  Here in the US, there ain't jack, and what little there is, is horrendously overpriced -- $130 for a standard-form-factor medium-base bulb that, as far as I can tell given the inconsistent and confusing way they list the specifications, appears to be the rough equivalent of about a 30W incandescent bulb.  (At that, it consumes 13W -- so if their published specs accurately represent reality, they've managed to make an LED light that's only about half as efficient as a compact fluorescent that costs twenty times less.  Who in their right mind is going to buy that?  They should surely be getting a HELL of a lot more light output from 13W worth of LEDs.)

For now, I guess I'll be just putting a new incandescent fitting into it.  Hopefully, I'll be able to find a decent-quality one.  (I shudder every time I look at replacement light sockets at the hardware store and see cardboard insulation.  Whiskey tango foxtrot, over?!?)

Comments

[robbat2.livejournal.com]

Be careful with your units.
The lumens/candela significence is important.

1 lumen = 1 candela emitted into a solid angle of one steradian.
CFL's emit uniform light from a surface - these tend to approach 2π steradians of an emission direction. LED's on the other hand tend to have a much narrower beam.

Thus directly comparing a 600lm/50W incandescant - 520lm/15W CFL - and the incandescant will seem brighter by a large margin (I know the numbers don't line up exactly, but I had boxes for both of these on hand).

Doing a bit of research, I see current commercial white LED's get up to 65lm/W (expensive however), with the average being closer to 30lm/W. Tungsten incandescent manages 15lm/W, and CFL's average 60lm/W.

However it's important to note that LED's are by design DC devices, so you have to either put up with flickering at your power frequency (both 50/60Hz suck for this, I can see my CRT flicker at that rate, I don't want my lights doing the same), or do power conversion. Using a rectification setup you could probably manage 70% conversion efficency. Applying that efficency to your numbers, that shows their LED's are actually doing 44lm/W of the power that they are recieving.

[ithildae.livejournal.com]

Another significant difference is the spectrum generated. Incandescents generate a quite wide spectrum of light. CFL's are UV shifted down to visible by that white coating inside the bulbs. They also produce a somewhat wide spectrum. LED's produce a single wavelength. The "white" LED's are also UV, shifted. Monochromatic light is not something that you will be very happy living in.

[unixronin.livejournal.com]

I know the "white" LEDs use a UV-excited phosphor mix, as do CFs. The spectrum of incandescents is pretty terrible, most of their radiated energy is IR, but old-style fluorescents used to be even worse, with a discontinuous spectrum with lines in some very odd places. (They've improved a lot. When I had to use conventional tubes, I'd generally pay the extra and buy full-spectrum tubes.)

The really nice thing about LED lighting is that with some of the tricolor panel solutions people are experimenting with, you can selectively adjust the RGB output to tune the color balance to your preferences. I'm quite happy with something as close to daylight as I can get, most of the time, and when I don't want daylight, I usually want either just generic dim light or real firelight.

There's three main reasons I'd like to switch over to LED lighting as soon as possible: long life, low power consumption, and minimal waste heat.

[ithildae.livejournal.com]

I haven't found any commercial outlet for tricolor LED panels. As far as I know, you build your own, or do without. I built my own.

I understand the three reasons. They closely mirror my own reasons for wanting to switch to LED's. I am trying to set my house up for wind power. I have a homemade windmill up right now. Not much in the way of output, but anything that offsets the cost of my computer's runtime is worthwhile.