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Is it common/wise to invest in multiple flashers for different situations or can you use one given it has enough intensity? Another way to read this is: can a flash be too bright?

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4  
Wow, sorry, but I think this question is way too broad. The way I read it, it's the start point for a rather large book on the topic of lighting... What are you trying to do? The amount, and nature, of lighting varies from scene to subject to purpose. There's no magic answer here. –  John Cavan May 16 '11 at 0:56
    
Sorry, Rephrased the question in attempt to narrow it down to what I'm actually looking for. Only trying to understand if it is a good practice to look into multiple flash levels. Please feel free to edit anyone. –  Imagen May 16 '11 at 1:13

2 Answers 2

up vote 3 down vote accepted

You can typically reduce a flash's intensity, either by lowering it's power setting (I have a couple that go to 1/64 their full power), or by adding "neutral density" gels to it. So you can almost always make a flash less bright if necessary.

But it's pretty much impossible to make a single flash brighter.

So, there's usually very little danger in having a flash that's too bright. Most times you'll have the opposite problem.

However, there's lots of other good reasons to have multiple flashes. @mattdm has already mentioned having multiple lights with multiple angles. And occasionally, when you need a lot of light, you'll want multiple bright flashes (usually mounted on some sort of bracket). This is most common when shooting outdoors in full daylight, and you still want to shape your light; you need enough flash to overpower the sun.

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Augustin-Jean Fresnel may want to take issue with your second paragraph... Mind you, that is more about shaping and directing the light, but the perception is brighter. :) –  John Cavan May 16 '11 at 2:33
    
@John: I hereby invoke my "pretty much" exception :-P –  Craig Walker May 16 '11 at 13:26
1  
LOL, I couldn't resist. :) –  John Cavan May 16 '11 at 13:54

For many typical situations, having one (mid- to high-end) flash provides plenty of light in terms of quality, but it's not necessarily where you want it. Take a look at questions here in the tag for some very nice explanations (including diagrams) of some basic portrait-lighting setups, many of which involve multiple light sources.

Another part of your question seems to be about flash power. Almost all modern hotshoe strobe flashes automatically (either through camera control or their own sensors) fire at reduced power when the full discharge isn't required for the exposure. Or, you can set power level manually (to various degrees depending on the exact flash model).

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