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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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#1
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Corn type LED lamps
Would I be correct in suggesting that corn type LED lamps are best
suited to situations where the light required is at right angles to the axis of the light please? As in a outside lantern type of fitting.. |
#2
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Corn type LED lamps
On Mon, 22 Aug 2016 16:55:03 +0100, Harry Bloomfield wrote:
Would I be correct in suggesting that corn type LED lamps are best suited to situations where the light required is at right angles to the axis of the light please? As in a outside lantern type of fitting.. I've got a huge one in my living room (150W equivalent I think). It's got LEDs round the sides and the end. It's mounted vertically (pendant fitting way up), and lights the room as well as a CFL stick or an incandescent. I much prefer them to CREE ones with a smaller number of very hot LEDs that don't last very long. But my favourite are striplight LEDs (look just like flourescent tubes till you turn them on then the light is much nicer (no flicker)). -- A high IQ is like a Jeep. You still get stuck, just further from help. |
#3
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Corn type LED lamps
On Mon, 22 Aug 2016 16:55:03 +0100, Harry Bloomfield wrote:
Would I be correct in suggesting that corn type LED lamps are best suited to situations where the light required is at right angles to the axis of the light please? As in a outside lantern type of fitting.. I don't know about these "Corn" type LED lamps of which you speak, unless you're referring to the "Corn Cob" type LED lamp. Assuming this is the type you mean, then yes, imo! They'd be better suited, especially if the luminary orients the lamp in the "Cap Down Burning" position to avoid overheating the electronics in the base[1] due to the very poor ventilation characteristics most such outside luminaries are cursed with in the interests of keeping them reasonably proofed against rain ingress (the tiny breather holes, designed to prevent build up of damp and exclude most insects larger than an Earwig, don't really count as ventilation holes for the purposes of keeping the lamp cooled). [1] For lamps rated less than 20W, such "electronics" may be nothing more than a "capacitive dropper" rather than a built in sophisticated constant current driver module. If a suitably high temperature capacitor is used, they may be able to tolerate much higher temperatures than a "transistorised" switching regulator module could ever hope to cope with. -- Johnny B Good |
#4
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Corn type LED lamps
On Monday, 22 August 2016 16:55:09 UTC+1, Harry Bloomfield wrote:
Would I be correct in suggesting that corn type LED lamps are best suited to situations where the light required is at right angles to the axis of the light please? As in a outside lantern type of fitting.. Have a look at this. https://www.youtube.com/watch?v=lJNsK4BNSDs |
#5
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Corn type LED lamps
Johnny B Good wrote:
I don't know about these "Corn" type LED lamps of which you speak, unless you're referring to the "Corn Cob" type LED lamp. First came LED corn cob lamps, e.g. http://img.dxcdn.com/productimages/sku_45375_1.jpg Then lamps built around COB (chip on board) LEDs where the bare modules come in various shapes and sizes, but typically submerged in yellow phosphor e.g. http://img.dxcdn.com/productimages/sku_373438_1.jpg Now there are corn-cob style lamps using COB LEDs! http://img.dxcdn.com/productimages/sku_239373_1.jpg |
#6
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Corn type LED lamps
On 22/08/2016 16:55, Harry Bloomfield wrote:
Would I be correct in suggesting that corn type LED lamps are best suited to situations where the light required is at right angles to the axis of the light please? As in a outside lantern type of fitting.. I like the filament type LEDs for their omnidirectional output. They look nicer than cob type, but they are normally only available in 60W equivalence power ratings. -- Cheers, John. /================================================== ===============\ | Internode Ltd - http://www.internode.co.uk | |-----------------------------------------------------------------| | John Rumm - john(at)internode(dot)co(dot)uk | \================================================= ================/ |
#7
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Corn type LED lamps
On Mon, 22 Aug 2016 18:26:40 +0100, Andy Burns wrote:
Johnny B Good wrote: I don't know about these "Corn" type LED lamps of which you speak, unless you're referring to the "Corn Cob" type LED lamp. First came LED corn cob lamps, e.g. http://img.dxcdn.com/productimages/sku_45375_1.jpg Then lamps built around COB (chip on board) LEDs where the bare modules come in various shapes and sizes, but typically submerged in yellow phosphor e.g. http://img.dxcdn.com/productimages/sku_373438_1.jpg Now there are corn-cob style lamps using COB LEDs! http://img.dxcdn.com/productimages/sku_239373_1.jpg IMO it's best to avoid "corn cob"; yes, "corn" is because the lamp/LEDs look a bit like corn-on-the-cob, fair enough, but, although some corn are COB most are SMDs. I've some v. good COB lamps, with the LEDs on v. translucent ceramic blades and they give good dispersion and stay cool. -- Peter. The gods will stay away whilst religions hold sway |
#8
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Corn type LED lamps
In article ,
Harry Bloomfield wrote: Would I be correct in suggesting that corn type LED lamps are best suited to situations where the light required is at right angles to the axis of the light please? As in a outside lantern type of fitting.. Corn cob LEDs are often a way of using many very cheap and inefficient low powered LEDs, rather than properly. -- *Be careful about reading health books. You may die of a misprint. Dave Plowman London SW To e-mail, change noise into sound. |
#9
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Corn type LED lamps
On Tuesday, 23 August 2016 10:57:47 UTC+1, Dave Plowman (News) wrote:
Corn cob LEDs are often a way of using many very cheap and inefficient low powered LEDs, rather than properly. Some use sm LEDs and unisolated PSUs, meaning touching them when powered may cause a nasty shock. All part of the fun of buying from China. NT |
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