Safe Speed Forums

tempoary signs have to be lit to an average 100 lumins across the face of the sign. How bright is that? could that be provided with a battery light the size of a standard flashing road lamp and how often would the batteries need changing?
they usually hold two of those big 9v batteries.

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Speed limit sign radio interview. TV Snap Unhappy
“It has never been the rule in this country – I hope it never will be - that suspected criminal offences must automatically be the subject of prosecution” He added that there should be a prosecution: “wherever it appears that the offence or the circumstances of its commission is or are of such a character that a prosecution in respect thereof is required in the public interest”
This approach has been endorsed by Attorney General ever since 1951. CPS Code

<SIGH> Just when you want a Paul - hey !

I found this on the RS Component site ...
and here but I looked up 100 lumens and they then say 1200 ?? but that has a life of 12,000 hrs

and [url=http://docs-europe.electrocomponents.com/webdocs/0af3/0900766b80af3da3.pdf]Cree LED lighting
[/url] and here

Find this interesting too.
and here ...
and here.

I hope that helps a little.

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Safe Speed for Intelligent Road Safety through proper research, experience & guidance.

You can illuminate a sign with 100 lumens of light with about 5 watts....you just have to focus the light onto just the sign....

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The world runs on oil, period. No other substance can compete when it comes to energy density, flexibility, ease of handling, ease of transportation. If oil didn’t exist we would have to invent it.”

56 years after it was decided it was needed, the Bedford Bypass is nearing completion. The last single carriageway length of it.We have the most photogenic mayor though, always being photographed doing nothing

I think there is a bit of confusion here over units.

Lumens are a measure of the total amount of light emitted by a source. Illumination level is measured in lux (lumens per square metre) falling on the object.

To give you some idea, the minimum illumination level of a desk in an office should be 300 lux.

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Malcolm W.
The views expressed in this post are personal opinions and do not represent the views of Safespeed.

100 lumens can be realised with a 1 watt power source using commercially available LED tech.

I don’t know what 9V battery you are referring to, but if the energy capacity is anything like this 6V version; two of these (using an appropriate switching supply) will yield 156WH, so will give about 156 hours of illumination in this case, so about 2 weeks of useful life.

1 Lux is 1 lumen per square meter. It is possible to say ‘100 lumens across the sign’, but the intensity will be dependent on the area of the sign.
The current intensity at my desk is 550 lux.

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Views expressed are personal opinions and are not necessarily shared by the Safe Speed campaign

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The world runs on oil, period. No other substance can compete when it comes to energy density, flexibility, ease of handling, ease of transportation. If oil didn’t exist we would have to invent it.”

56 years after it was decided it was needed, the Bedford Bypass is nearing completion. The last single carriageway length of it.We have the most photogenic mayor though, always being photographed doing nothing

interesting , thanks

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Speed limit sign radio interview. TV Snap Unhappy
“It has never been the rule in this country – I hope it never will be - that suspected criminal offences must automatically be the subject of prosecution” He added that there should be a prosecution: “wherever it appears that the offence or the circumstances of its commission is or are of such a character that a prosecution in respect thereof is required in the public interest”
This approach has been endorsed by Attorney General ever since 1951. CPS Code