Comments on: a bit of light advice

By: sphinky brewster

sphinky brewster — Fri, 04 May 2012 04:20:58 +0000

sure….in the old days more power meant brighter.
tHE Question was an attempt to gain a relative understanding so meaningful comparison could be made.
How bright is a lumen!
How bright is a light required to be? To see or merely be seen?
Is there a lumen in a skully…or 50?

By: schmadzie

schmadzie — Wed, 27 May 2009 01:44:46 +0000

I knew that!
Thanks for the nice clear explanation Daniel

By: Daniel S

Daniel S — Tue, 26 May 2009 12:32:22 +0000

Lumens is the amount of light produced, and Watts is the amount of power used. Two very different things. Higher lumens means more light (good), and you probably want lower power ideally.

Traditionally we think of brightness in terms of watts because that’s how old light bulbs are labelled, and comparatively, the same light bulb technology has more lumens per watt. This no longer works with newer technologies such as leds which are low watts, and high lumens.

So to get an idea of brightness, use lumens. To get an idea of efficiency, use lumens per watt i.e. output/input aka brightness/power

sorry for all the techno mumbo jumbo, but somebody did ask

By: nicholasb

nicholasb — Thu, 21 May 2009 00:06:27 +0000

I don’t quite understand it myself, but comparing lumens and watts is like comparing apples and oranges – both delicious, but very different things.

Come by the shop and dark and stormy night, and we can do an in person comparison.

You can read this if you want to learn more –
http://www.brillianz.co.uk/data/documents/Lumen.pdf

By: mike strutter

mike strutter — Wed, 20 May 2009 22:24:04 +0000

good point Mr R Svarka, that would be good information to know if i’m to Bike Wise in the city

By: Mr R Svarka

Mr R Svarka — Mon, 18 May 2009 11:08:48 +0000

how are watts different to Lumens?

how many lumens does a 1 watt Basta eggwhite put out? (for relative comparison)

thanks

By: Mark Heydon

Mark Heydon — Fri, 15 May 2009 14:45:27 +0000

I’ve used the B&M Fly IQ and B&B D-Toplight rear light with a Schmidt dynamo over the loooong English winter.
They are brilliant. Specially like the fact they trun on automatically when needed.