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#11
10-20-2010, 03:21 AM
 JohnS Moderator Join Date: Dec 2007 Location: SE Michigan, USA Posts: 9,438 Rep Power: 19
Re: Comparing lumens and candlepower?

[QUOTE=Unregistered;74142]
Quote:
 Originally Posted by Unregistered conversion of 10,000,000,00 candle light power vs. lumens?
See post #9. There is no answer unless the beam angle is specified.
#12
02-28-2011, 06:48 PM
 Unregistered Guest Posts: n/a
Re: Comparing lumens and candlepower?

Guys just came upon this discussion, cause I also was curious on the comparison. I am a firefighter and most of our handheld lights are measured in CP. However my fishing headlamps and neck lights are measured in lumens.
From your discussion I think lumens might be a better measurement for firefighting search lights what do you think?????
#13
03-23-2011, 09:44 PM
 Unregistered Guest Posts: n/a
Re: Comparing lumens and candlepower?

This isn't so hard guys. It seems clear that he really doesn't want to understand the difference. It's all good information but I'm standing here in Walmart looking for a spotlight to use on my airboat at night for spotting gators and frog gigging, etc. Back in the candlepower days, finding one was easy. The more candlepower... the bigger and brighter and more badass your light was. Guys actually use the candlepower number to brag about their light. Now back to my spotlight. There's one here that says 3,000,000 candlepower. I know that's a pretty bright damn light. I have to plug that one in. There are others of similar shape a size that are battery powered. But they are in lumens. For a spotlight I have no point of reference for how good of a spotlight these make. With all your knowledge, how would you make a decision here? How many lumens do I need in my spotlight to make my airboating buddies jeallous?
#14
03-24-2011, 10:27 AM
 Mrs X can't count, can't spell! Join Date: Feb 2006 Location: New Zealand Posts: 2,410 Rep Power: 12
Re: Comparing lumens and candlepower?

Quote:
 Originally Posted by Unregistered This isn't so hard guys. It seems clear that he really doesn't want to understand the difference. It's all good information but I'm standing here in Walmart looking for a spotlight to use on my airboat at night for spotting gators and frog gigging, etc. Back in the candlepower days, finding one was easy. The more candlepower... the bigger and brighter and more badass your light was. Guys actually use the candlepower number to brag about their light. Now back to my spotlight. There's one here that says 3,000,000 candlepower. I know that's a pretty bright damn light. I have to plug that one in. There are others of similar shape a size that are battery powered. But they are in lumens. For a spotlight I have no point of reference for how good of a spotlight these make. With all your knowledge, how would you make a decision here? How many lumens do I need in my spotlight to make my airboating buddies jeallous?
This is easy! - Buy them both, and sell the one you don't like on ebay.
From Mrs X, Always being helpful!!!!
#15
03-24-2011, 12:07 PM
 Robert Fogt Administrator Join Date: Dec 2005 Location: Seattle, WA Posts: 3,449 Rep Power: 13
Re: Comparing lumens and candlepower?

Quote:
 Originally Posted by Unregistered This isn't so hard guys. It seems clear that he really doesn't want to understand the difference. It's all good information but I'm standing here in Walmart looking for a spotlight to use on my airboat at night for spotting gators and frog gigging, etc. Back in the candlepower days, finding one was easy. The more candlepower... the bigger and brighter and more badass your light was. Guys actually use the candlepower number to brag about their light. Now back to my spotlight. There's one here that says 3,000,000 candlepower. I know that's a pretty bright damn light. I have to plug that one in. There are others of similar shape a size that are battery powered. But they are in lumens. For a spotlight I have no point of reference for how good of a spotlight these make. With all your knowledge, how would you make a decision here? How many lumens do I need in my spotlight to make my airboating buddies jeallous?
You could try visiting the manufacturers website. Hoping they will have that information posted. Or at least contact information.
#16
04-19-2011, 09:41 PM
 Unregistered Guest Posts: n/a
Re: Comparing lumens and candlepower?

why can't anyone just approximate what a one million candlepower spotlight equates to however lumens? That's what people want to know. f46redtx@aol.com I would like an answer. Thanks
#17
05-08-2011, 06:03 PM
 Unregistered Guest Posts: n/a
Re: Comparing lumens and candlepower?

I own a 4500 lumen, 50 watt, HID flashlight. I was wondering if anyone can give me a close answer on about how many candle power that would be compared to
#18
05-12-2011, 03:01 PM
 Unregistered Guest Posts: n/a
Re: Comparing lumens and candlepower?

I'm waiting on two manufacturers to tell me this comparison.

Assuming a halogen bulb puts out 18 lumens/watt and these million candlepower lights use a 35 W bulb you get 630 lumens.

Ryobi has a 2800 lumen spot that uses a 55 W and they tell me it's 200 candlepower.

OK on the steradians but for a spotlight with a parallel beam the angle is zero.

I have an BSEE and MSEE and I can't make sense of it.
#19
05-12-2011, 03:25 PM
 Unregistered Guest Posts: n/a
Re: Comparing lumens and candlepower?

Here's a statistical way to find out the comparison. . .

Plot the data below from Nextag and Black & Decker spotlights on Excel and see if you can find a trendline between cp, W and L

3M cp, 100W, 2100 L or 2000 L
15,000 cp, 75 L
30,000 cp, 135 L
38,000 cp, 200 L
1M cp, 55 W

E.g., the average cp per w is ~24,000 cp/W assuming the same incand. bulb technology. However, the lumens per watt varies with the bulb wattage, according to Wikipedia.

The more datapoints you can collect, the more accuracy your answer will have.
#20
05-12-2011, 03:46 PM
 Unregistered Guest Posts: n/a
Re: Comparing lumens and candlepower?

Quote:
 Originally Posted by Unregistered I own a 4500 lumen, 50 watt, HID flashlight. I was wondering if anyone can give me a close answer on about how many candle power that would be compared to
From my previous two posts I get 7,000,000 cp.

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