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23 votes

Solar energy without the sun: Super LED light on top of solar panels?

There are a number of questions there. "Can LED light provide same amount of energy as sunlight?" In total, no, at least with humanity's available resources. The sun is kinda big. Per unit area? ...
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  • 3,591
17 votes
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What to do with old, unused incandescent light bulbs

TLDR; don't use them for lighting. Given that you could keep your incandescent bulbs for when your current energy-efficient (I will assume CCFL) bulbs need replacing, your choice boils down to: buy a ...
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  • 1,012
13 votes

What form of electrical lighting has the smallest energy-footprint?

i signed up just so i could make this comment. THelper♦ provided a good link to a DOE report on this topic, which i was researching because my roommate is skeptical about the advantages of efficient ...
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  • 231
11 votes

What to do with old, unused incandescent light bulbs

I use them in garden/indoor. Something like this... (source : google search)
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  • 231
9 votes

Should I replace existing inefficient light bulbs?

Sort of. Consider the pay back time. high efficiency lights are expensive. Expense is, at least in part, a measure of the resources used to make it.* Replacing the fixtures in the kitchen where the ...
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9 votes

What to do with old, unused incandescent light bulbs

I disagree with the answers that say not to use it. It may in fact be an excellent idea to use it if: you live somewhere that requires your home to be heated in the winter you currently heat with ...
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8 votes
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Are incandescent light bulbs recyclable?

I assume you are talking here about incandescent light bulbs. From looking around the Internet and from my personal experience, here is what I can say: In the countries I have lived in (France and ...
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  • 3,212
8 votes
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Is it economical / sustainable to switch from CFL to LED?

To answer your question about whether or not it's financially worthwhile to swap them out, I looked at two simlarly rated lamps from the same manufacturer: Philips 60W equivalent CFL: 14W power ...
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7 votes

How much energy could we save if we all got up at sunrise

The best analogy for this is the use of daylight savings time, where in effect people wake up one hour early than they usually do. A study by the US Department of Transport in 1975 (see page 4 of the ...
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  • 3,042
7 votes

What to do with old, unused incandescent light bulbs

Please consider donating incandescent bulbs to a support group for diseases that can sensitize some people to light. One disease with fairly widespread support group chapters is Lupus. Lupus has ...
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7 votes
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Energy saving lamps suggestion

The wattage given on the fixture refers to the maximum that can safely be used. That will be dictated by two things: The internal wiring of the fixture, and the heat that it can tolerate. In reality ...
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  • 3,591
7 votes

Are incandescent light bulbs recyclable?

I received a similar question on my own website a while back, and was surprised when I researched the answer. I thought it was mostly newer technology light bulbs that were recycled to avoid ewaste, ...
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6 votes

What to do with old, unused incandescent light bulbs

Osram did a good comparative life cycle assessment on bulbs, including incandescent, CFLs, and LEDs. The total life cycle impacts of CFLs and LEDs are both significantly lesser in all categories than ...
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6 votes

Anything similar to GravityLight that can be readily purchased?

The big advantage of GravityLight is that you can pull the weight once and then you have electricity for a relatively long period (I read somewhere it's 30 minutes). This is ideal when you need to ...
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5 votes

What to do with old, unused incandescent light bulbs

What to do with existing stock of incandescent bulbs – use them up or just put an LED in any socket where a lamp burns out? As efficient LED bulbs are widely available the question comes up what is ...
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4 votes

What to do with old, unused incandescent light bulbs

I would hold a few in reserve in case you ever find a need for them. For instance, I used an 85W incandescent bulb and a steel coffee can to create a small "space heater" for young chicks (chickens). ...
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4 votes

Why are my LED light bulbs so short lived?

I haven't had this problem either. I've never even heard of it. Of the lighting that I use regularly, almost all of it is CFL or (lately) LED. I have almost no incandescent bulbs left. I prefer the ...
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  • 159
4 votes
Accepted

Energy requirements for sustainable food production system

Given the uncertainties in many of your numbers, your answer is consistent with Nate Storey's. Your assumption of 303 lm/W for LEDs doesn't look plausible to me - that's very different to the sort of ...
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  • 14.6k
4 votes

Why are my LED light bulbs so short lived?

We've been using CFL bulbs for more than 15 years & LEDs for about 5, and have so far had great results with most. The few we've had difficulty with early demise were either: cheapies in ...
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  • 339
3 votes
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Can artificial lighting compete with horizontal agriculture?

Vertical Farming does already compete with horizontal farming. I read an article about a lettuce farm in Japan that was producing 10,000 head of lettuce a day. The research showed that the vertical ...
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3 votes

What form of electrical lighting has the smallest energy-footprint?

There is a lot of efficiency variation that depends on the quality of the LEDs. Cheap LEDs are no better than CFLs. High quality LEDs from brands like Cree or Philips can be over double the ...
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2 votes

Solar energy without the sun: Super LED light on top of solar panels?

Why not just use the power that is powering the LED lights? You cannot produce more power than you consume. That would be a perpetual motion machine and is generally accepted as not possible. ...
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  • 383
2 votes

Solar energy without the sun: Super LED light on top of solar panels?

Obviously you are not going to get a net return on investment on the energy you put into your LED. If you could, you'd have a perpetual motion machine which is impossible. However, there are cases ...
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2 votes

Are there any bright candelabra base LED bulbs equivalent to a 60-75 Watt incandescent?

I'd been looking for a 60W equivalent candelabra base bulb for a while too. For the past few years the highest equivalent available to consumers was 40W. Now it looks like the 60's are finally making ...
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  • 121
2 votes

Anything similar to GravityLight that can be readily purchased?

In addition for already mentioned advantage that you only put effort once and then have a dozens of minutes of uninterrupted usage (which is important as one of the main goals was enabling reading/...
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2 votes

What to do with old, unused incandescent light bulbs

I have one light that is my old bulb user. I figure it does cost more to use them but I get use out of them. I only have one light that uses incandescent bulbs. I kind of use it as a shrine to ...
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2 votes

Is it economical / sustainable to switch from CFL to LED?

At present it is not sustainable. There isn't enough difference in efficiency. All bulbs have Hg according to Wikipedia, but 'eco friendly' have less. Jonny's comment prompted a check. "Eco ...
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2 votes
Accepted

Do light fixtures with small solar panels require direct sunlight?

Solar panels receiving indirect sunlight Indirect sunlight produce around 10% to 25% of their optimal output. A solar panel of the size illustrated could optimally churn out around 4W with direct ...
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1 vote

Is it economical / sustainable to switch from CFL to LED?

Right off the bat, I would say that LEDs make much more sense sustainability wise since CFLs contain Mercury which makes broken CFLs hazardous waste! I will see if I can hunt down figures for ...
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