Thanks for the link to the Philips high bays, they must be very expensive, but are high performance, the best by today's standards, for sure.
'"CLO", i.e. constant light output" this makes sense
The link to future site works for me, just tried it out, not sure why it does not work for you.
@jitter, you have done your homework very well, thanks Rick
'"CLO", i.e. constant light output" this makes sense
The link to future site works for me, just tried it out, not sure why it does not work for you.
@jitter, you have done your homework very well, thanks Rick
They definitely are expensive. The Dutch site of Philips Lighting has a 1,220 pages pdf (called "Licht Pocket 2012") available with all products on the Dutch market, including MSRP (excl. VAT).
The small version costs € 1,060, the big version € 1,670. Roughly 2 times the price of the HID highbay luminaires they're intended to replace (apparently highbay luminaires with fluorescent tubes aren't common over here, the Licht Pocket lists none, so no comparison on prices for that type).
The link works for me too, now. Probably a temporary problem.
The small version costs € 1,060, the big version € 1,670. Roughly 2 times the price of the HID highbay luminaires they're intended to replace (apparently highbay luminaires with fluorescent tubes aren't common over here, the Licht Pocket lists none, so no comparison on prices for that type).
The link works for me too, now. Probably a temporary problem.
Stonco TBW654EB4-8 T-Bay II 6-Light T5HO Fluorescent High Bay 120-277V
$135.00USD not including the lamps
HID Equivalent600WLight Output30,000+ LumensInput Watts360
Compared to this
TCP TCPRADIANT100H 150 Watt Radiant LED Luminaire 120-277V
$999.00 USD
Lumens11090 Watts150 Watts
$135.00USD not including the lamps
HID Equivalent600WLight Output30,000+ LumensInput Watts360
Compared to this
TCP TCPRADIANT100H 150 Watt Radiant LED Luminaire 120-277V
$999.00 USD
Lumens11090 Watts150 Watts
That's quite a difference and IMHO it would only be interesting to go for the LED highbay light if the price of electricity were to rise, the price of the luminaire to come down or if replacing tubes would require the rental of equipment to reach the luminaires.
By accident I stumbled on this user review of the newest generation retrofit LED lightbulb using not only blue LEDs but also red LEDs in combination with remote phosphor technology.
When the price of this one comes down, it sure looks interesting: 92 lm/W, CRI of 92.
By accident I stumbled on this user review of the newest generation retrofit LED lightbulb using not only blue LEDs but also red LEDs in combination with remote phosphor technology.
When the price of this one comes down, it sure looks interesting: 92 lm/W, CRI of 92.
I have not watched the video, but read that the lady took them back to Home Depot, so that tells me enough.
Putting a monochromatic red LED light through phospher, do not understand why. Ask the guy named Roger www.rogiervanderheide.com who answers questions on the Philips web site, he would know why.
FYI, pretty well all high bays require a lift or a monkey to service or they would not be called hi-bays. I am surprised that T5HO is not commonly used in Holland considering that is a Philips/OSRAM designed lamp.
Rick
Putting a monochromatic red LED light through phospher, do not understand why. Ask the guy named Roger www.rogiervanderheide.com who answers questions on the Philips web site, he would know why.
FYI, pretty well all high bays require a lift or a monkey to service or they would not be called hi-bays. I am surprised that T5HO is not commonly used in Holland considering that is a Philips/OSRAM designed lamp.
Rick
No, it is a monochromatic source with a narrow BW of around 20nm. Take a look at the blue LED spec's of the spectral plots.
They are using blue LED's in the 440-460nm range, UV is in the 200-300nm range, a long way apart, that is one of the LED selling points, no UV.
Fluorescents use mercury with it's quantum peaks in the UV range, thus some bleeds through the phosphor and the glass. A FL UV lamp uses quartz, no phosphor at all, so that it does not attenuate the UV as much as regular soda lime glass would.
I used to work in fibre optics, there are international standards for light sources such as lasers, which emit highly concentrated light in the visible spectrum. By law, you as a mfg, are to label your product accordingly, if it emits light that is above certain limits. A LED does not fall into this catagory or the LED mfg's would be forced, by law, to label their products accordingly.
The wiki article does not address these light levels, just calls them HEV with no numbers. These #'s are availble but I do not have a reference to provide.
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Error in my definition of the UV band, should be defined as in the 100-400nm range
Ultraviolet - Wikipedia, the free encyclopedia
Should have said a "FL UV sterilization lamp uses a quartz envelope"
Sorry
Ultraviolet - Wikipedia, the free encyclopedia
Should have said a "FL UV sterilization lamp uses a quartz envelope"
Sorry
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I wonder where you read that. The reviewer mentions that dimming this bulb below ~50% leads to an ugly light colour, so that maybe a reason...
At the time the video was posted it was not available in the stores (the guy in the video says he had won it). In the Dutch product catalogue, they're still not listed. They are in the global catalogue, and it says they're assembled in USA, so maybe that's why they're already available on your side of the ocean and Philips trying them out there first...
My guess is that converting light to longer wavelengths with phosphor is less efficient than emitting it from the start...
Perhaps our high bays aren't as high as your's...? A couple of years ago a FedEx distribution point was built right next to the company I work for. The storage space is high in comparison to what we're used to. The lighting is T5HO, but only two tubes per luminaire. Most "budget" stores, even built a couple of years ago, still use T8 fluorescent tubes (usually 36 W or 58 W). Other stores and supermarkets use a lot of metal halide lighting. HID high bay luminaires are mostly found lighting DIY centres.
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Funny that we got back to this point, as this was my initial statement in this discussion thread, where we were discussing luminous efficiencies comparing using 3 LED sources, (RGB) vs a single LED source (Blue) plus phosphor. I stil have my doubts but I do not have any data to back my suspicions. This information adds some weight to my earlier statements.
Warehouse ceiling heights! Can't fit much into a warehouse if the ceiling height is low. Most warehouses in North America are at least 30-40 ft (10-12m) high.
Hard to imagine that NA is ahead of Europe in deploying higher efficiency lighting in the comercial/industrial space. Our sales of T5HO ballasts far out number our HID ballast sales, even with US DOE imposing a >88% HID ballast efficiency regulation. Only allowed to use Pulse-start HID fixtures/lamps/ballast, older probe-start HID's are basically outlawed as near impossible to meet the 94% efficiency requirements imposed, even if you use an electronic HID ballast.
Well, now there seems to be a version in between: blue + red and phosphor. Perhaps the efficiency of red LEDs has been improved enough to be of use in general lighting? It is claimed that these are the most efficient retrofit LED bulbs at the moment and I guess that wouldn't be possible if the red LEDs were inefficient...
That sounds similar to the building of our neigbours. I would expect the ceiling height to be limited by the max. safe reach height of fork lifts...
The racks are spaced just enough apart for a forklift to turn. The luminaires are positioned right between the racks, just above top level. From what I could see, they looked like a dual tube version similar to these. IMHO, a 4/5/6 tube luminaire would have been a waste of light. Perhaps these are more suitable for open spaces.
In DIY centres with heigh ceilings, you will almost invariably find HID lighting with this kind of transparent bowl.
I don't have all the facts, but it would seem that way. But perhaps we're ahead on some terrains and behind on others.
A plastics moulding plant I pass on the way to work every day has built a new production hall. Last week I discovered long and narrow LED luminaires are lighting the space. Looks like they're skipping T5 and going straight for LED
No doubt there will be regulations over here too for industrial lighting. Consumer lighting has had an energy label for years now indicating the efficiency and this site also mentions regulations for lighting in the "tertiary" sector.
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I just noticed I missed this:
I think LED does fall in this category, there's a "Class 2 laser product" warning on one of my LED flashlights (see post #83 of this thread).
I think LED does fall in this category, there's a "Class 2 laser product" warning on one of my LED flashlights (see post #83 of this thread).
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Here is a fun idea for LEDs.
GravityLight: lighting for the developing countries on Vimeo
Of course it would work with other light sources, but LEDs make it more practical.
GravityLight: lighting for the developing countries on Vimeo
Of course it would work with other light sources, but LEDs make it more practical.
Our large manufacturing plant has switched from HID to fluorescent, and in warehouse areas we're now retrofitting the fluorescent fixtures with direct-replacement LED replacement lamps (bypassing the ballasts). The fixtures are on motion sensors, so when nobody's in the area they shut down. Can't do that with HID, fluorescent won't last long that way either. Nobody has to remember to shut off the lights on a down weekend. Not as many trips by an electrician on a scissor lift to change lamps. Lots of wins there.
Bill
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