Does this really match the Equivalent of that ?. LED / Halogen Help.

neutralwhite

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hello there, I have this 20w LED floodlight and it states it matches a 250w Halogen, now is that correct?, as I also see a 10w on their site which tells that it matches a 100w halogen. ???.


the thing is, this will be for a small front garden, and I am always advised I should get an LED light no more than a 150w Halogen equivalent as it will be too bright, not good for eyes, all that.


the light seems warm and not that bright really, so does this 1800lm really match a 250w halogen, and can these spec figures really be relied on?.
shall I put the light up still, or leave it?.



thank you everyone............................:thumbsup: happy holidays.....




LED colour: Warm White (3000k) - Cool White (6000k)

Working voltage: AC85-265V

LED luminous Flux: 1800 lm (ideal for matching a 250W Halogen bulb)

Color temperature: 3000~3500K




http://www.strictlyleds.co.uk/235-20-watt-led-floodlight-with-pir-ip65-rated-.html
 
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RetroTechie

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hello there, I have this 20w LED floodlight and it states it matches a 250w Halogen, now is that correct?
No.

A decent guide as to how much light various sources put out @ given power levels, is this table.

Which tells you a 250W halogen lamp might put out ~4500 lumens or so. Now some of the most efficient white LEDs today (those that are one the market) are in the 150 lm/W range or thereabouts, so 20W of that gets you ~3000 lumens. Note that's raw LED efficiency. That lamp you're linking to "uses only 20 watts" (= drawn from AC socket), so its LED gets less. And there's a 150 lm/W LED in there? Most likely not.

So that 1800 lumen figure is certainly possible, which would put it on par with a ~100W halogen bulb. Mind you 1800 lumens is a lot of light already, especially if you're lighting up a small area. :)
 

LEDninja

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Is that an LED spotlight?

Some unscrupulous spotlight manufacturers will measure the light of a spot in a spotlight and compare it to the brightness of an omnidirectional bulb.
A countryman of yours once started a fun thread like "My torch is brighter than a 100 watt bulb" His torch had an SMJLED bulb (12 - 15 lumens) A 100 watt bulb is 1400 - 1600 lumens. So how can 12 -15 lumens be brighter than 1400 - 1600 lumens? The torch has a reflector which sends out a small circle of light 30 feet. The 100 watt bulb will light up in all directions but only to 20 feet. So in a 6 inch circle the torch's 12 - 15 lumens provides more light than 1400 - 1600 lumens. Outside that 6 inch circle the torch provides no light, the 100 watt bulb still have plenty.

A second issue is there are no good technical English - Chinese dictionaries. The site operator or the spotlight wholesaler (maybe even the manufacturer) got confused over lux and lumens. A 20W spotlight may be 1500 lumens but with 6000 lux. The site operator looks at the numbers and reads "My LED's 6000 lux is brighter than the halogen's 4500 lumens!" Apples and oranges.
 

MattPete

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Aug 16, 2013
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IIRC, my incandescent 65 watt bR30s put out 600 lumens or so, and the 120watt BR40s put out 1200-1300 lumens.

For comparison, my Philips IR-Halogen BR30s put out 730 lumens for 50 watts used (advertised as an 85-watt equivalent), and the 70-watt Br40 from that series puts out 1200 lumens (advertised as 120 watt equivalent).
 
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