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T O P I C R E V I E W
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TheMoMan
Member # 1659
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 posted October 11, 2010 05:16
http://news.cnet.com/8301-11128_3-20018915-
____ Sorry about the bad link, thanks Dman
http://news.cnet.com/8301-11128_3-20018915-54.html
____ I do not like the CFLs as they do not come up to bright fast enough, and out in the barn in the winter they are really slow. Filament lamps put out heat as Xan has posted I use them to keep equipment warm. I quess I will have to buy an LED to see how well they work for use here.
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dragonman97
Member # 780
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posted October 11, 2010 07:00
Working link:
http://news.cnet.com/8301-11128_3-20018915-54.html
(can't say /that/ was easy to find...)
Interesting...but fugly and expensive.
I'll hope early adopters bring the cost down for the rest of us...then I'll be willing to check out LED lighting.
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Ashitaka
Member # 4924
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posted October 11, 2010 07:32
FYI, I hate lumens, not really teh correct way of measuring light, use SI, W/sqm and an overview of the spectrum emitted.
Lux is a realative percieved brightness, in otherwords, not absolute, and depentant on trying to calculate the amount of light interpreted by a human brain. You would be very very very difficult to explainto an alien what a lux is.
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TheMoMan
Member # 1659
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posted October 11, 2010 07:39
____ Dman, I have several dusk to dawn motion lights, I can not put CFLs in them because they dim to 30% power and come up to full when activated. So I am going to buy one or two to see how well they work in the dusk-to-dawn fixtures, if good there then I'll buy some more. Until more manufacturers get on the LED cart prices will not fall very much.
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The Famous Druid
Member # 1769
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posted October 11, 2010 07:47
I'm not convinced LEDs are there yet for home lighting.
The output spectrum of white LEDs is usually either this...
or this...
Either way, even though the light appears 'white', I always feel like I'm straining to see something that's missing.
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TheMoMan
Member # 1659
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posted October 11, 2010 09:11
____ TFD, you bring up a good point. Each night I have to find the CAT, hateful little thing, the Mrs will not go to sleep unless the CAT is inside. The dog is no help, she will not participate in the CAT Search other than to tip off the CAT. If I use a normal flashlight the CAT appears to be tipped off by the light, however she, the CAT does not notice the LED flash light, I have several and none of them tip her off. I wonder if the Blue light does not register in her eyes?
____ Just an observation, that may stir further debate. Dman hateful CAT.
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GrumpySteen
Member # 170
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posted October 11, 2010 09:17
TheMoMan wrote:
I wonder if the Blue light does not register in her eyes?
Cats aren't very sensitive to color (there's some debate about whether they're color blind), but they are far more sensitive to light intensity than humans. The cat definitely sees the light, even if it can't pick out the color, but apparently doesn't associate it with something to run away from.
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Xanthine
Member # 736
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posted October 11, 2010 09:29
quote:
Originally posted by Ashitaka:
Lux is a realative percieved brightness, in otherwords, not absolute, and depentant on trying to calculate the amount of light interpreted by a human brain. You would be very very very difficult to explainto an alien what a lux is.
And yet perception is everything when it comes to lighting up your work or living space (lab instruments are another matter). My brother the lighting designer has to take that into account when he's working. It's a funny concept, but when you're designing something for humans you have to make sure it'll be comfortable for humans. ![[Wink]](wink.gif) Especially lighting. Working with crap lighting is tiring, almost as tiring as working with a bad heating system.
Some CFLs reach full brightness faster than others, in my experience. CFLs built to replace vanity bulbs or floodlights tend to be slow, but the standard ones have gotten quite good.
BTW, filament lamps need warm-up time too. You may not notice with your incandescent bulbs, but the light output does increase and stabilize after a period of time.
All of that aside, my experience with white LEDS is limited to headlamps. They're pretty good in that regard. I may have encountered LED room-lighting in a hotel in Switzerland; my brother said they were LEDs at any rate. They did a good enough job not to stand out in my memory as "crap". Maybe I should try one of these new bulbs.
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TheMoMan
Member # 1659
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posted October 11, 2010 09:55
____ Grumppy, I seem to be getting that with time she will know to run when hit with the LED?
____ Damn, I thought I was onto something.
____ I know that I can get her to chase the spot of light from my Laser Level, however the dog does not notice it or chooses to not bother.
____ The CFLs in the barn in the winter, are useless for the first minute, if they fire at all. Minus 20F really slows them down. Those temps also shorten the life of Incad. a lot something about being that cold and getting to heat in one or two cycles. Then having to warm up the argon. I use a sixty watter to keep my Transmitter warm so that it does not draw dew and or frost. A sixty under the engine on the tractor does wonders on how quickly it starts also.
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GrumpySteen
Member # 170
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posted October 11, 2010 13:00
TheMoMan wrote:
I seem to be getting that with time she will know to run when hit with the LED?
Yes, but you can manipulate her to avoid that happening.
Go out an hour or two earlier (but not before dusk, obviously) once in a while and hunt her down using the LED and give her a treat, but let her stay out. Cats respond to inconsistent rewards better than consistent rewards or punishment (most creatures do, including humans), so you don't have to do it too often to confuse her idea of what the LED flashlight signifies.
I can get her to chase the spot of light from my Laser Level, however the dog does not notice it or chooses to not bother.
Dogs can definitely see laser pointers, so I think your dog just doesn't care.
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