However amazing the vision of a photographer may be, however sharp their lens and regardless of the number of pixels on their camera’s sensor, the shot can only succeed if the lighting is right. It follows that we should commit both thought and budget to our lighting equipment. Studio photographers know this and typically spend far more on lighting than on cameras and lenses, but some people take the opposite approach and although they’re often prepared to spend far more than they need to on cameras and lenses, they sometimes underrate the importance of light and try to economize on the equipment that will actually make a real difference to the quality of their work.
I’ve written this article to help people who are about to make their first lighting decisions, or who want to make buying decisions that will help move their photography to the next level.
In the first half of this article, I’ll discuss the three basic lighting choices you’ll want to consider. In the second half, I’ll help you determine how much power you’ll need for your lighting kit, depending on the type of photography you will be doing.
There are 3 basic choices: flash, hotlights and cool lights. Flash is the tool of choice for any kind of people photography and we’ll come back to it in a moment.
There are two basic types: hotshoe flashes and studio flashes.
Hotshoe flashes are the accessory flashguns that fit onto the hotshoe of your camera. Using them on the hotshoe is convenient but the light is always harsh and never flattering, and if you want to get the best from your hotshoe flash then you’ll need to use it off-camera, fitted to a stand, and you’ll probably want to use several, to get controlled lighting effects. You’ll probably want to use them with umbrellas too, to diffuse the light.
Hotshoe flashes can be very useful but they’re really best for journalists and other people who need to use flash on the move. Studio lights are much better if you’re using them at home or in a studio.
Buying studio lights can be daunting, because there are so many different makes, different models, different specs and different prices—so the rest of this article will help you to understand what’s important and what isn’t, so that you can make the right choice for you.
Yes, pretty much, even though there are different types—mains powered self-contained lights (known as monolights or monoblocks), mains powered “separates” (known as Pack & Head lights), and battery powered.
Mains powered monolights are the most popular with people just starting out, probably because they’re much less expensive than the other choices. Monolights contain all of the “works” within the flash head itself—plug them into the wall and they’re ready to go!
Pack & Head lights have a separate powerpack that sits on the floor, and one or more flash heads are plugged in as required.
Pack & Head lights have several advantages over monolights, apart from the fact that they are available in far more powerful units than monolights. Firstly, all of the controls are set on the pack itself, which is always much easier and more convenient than when they’re on the head.
Battery Powered Pack & Head lights (above right) are useful because they can be used for location shoots where there is no power available, including outdoor use where high power (not available from hotshoe flashes) is needed to overwhelm the daylight.
The controls on portable power packs are basically similar to those on mains units
You can’t make an informed choice unless you can understand the technical terms and the specifications.
Power is expressed in Joules (J), or watt seconds (usually abbreviated to W/s) but never in watts. W/s is just another term that means exactly the same as Joules.
The figure expressed (300 for example) means that the flash head stores 300 Joules in its capacitors. It doesn’t mean that two flashes with the same power output from two different manufacturers will have the same actual power because there are other factors that affect actual power, but it’s a good guide. All things being equal, a flash of 300 Joules will produce the same amount of power during the flash (which could be as short as 1/2000th second) as a 300 watt continuous light can produce in one second. In fact, the continuous light actually produces far less power than that simply because most of the energy is in the form of heat not light. A three second exposure with continuous lights is normally needed at the same lens aperture as flash.
Guide numbers are a more accurate method of expressing power. The guide number is always tested at 100 ISO and should always be tested with the flash head fitted with a standard reflector. Guide numbers can be expressed in two different ways: meters and feet. As long as you know which is which you can easily work out the real power of the light. Let’s say that the guide number is 160 (feet). Simply divide the distance in feet from the flash to the subject into that number and you’ll end up with the lens aperture. At a distance of 10 feet from flash head to subject, the answer will be f/16 with the flash head at maximum power. If the guide number is expressed in meters, the same flash head will have a guide number of 48. 10 feet is 3 meters so 48 divided by 3 is f/16—same result.
Of course, the guide number depends on the type and the efficiency of reflector used. It will be higher if you’re shooting in a small room with white painted walls and ceiling. It will be a lot lower if you use an umbrella or softbox to diffuse the light. It will be lower still if you use a spotlight or honeycomb to control the light, but it’s the best guide there is.
I think it’s fair to say that 300J is plenty for most home studio use with a 35mm or digital SLR camera. Larger cameras (medium and large format) need a lot more power, so do large groups of people or complex still life shots. A lot of people are happy with less power, preferring to increase the ISO setting on their camera when they need more power. Increasing the ISO setting reduces the image quality but different people have different needs.
It’s no good having power if you can’t adjust it! Most modern flash heads can adjust from full to 1/16th or 1/32nd power. That’s a pretty good range and is plenty for most situations. Some have an even greater range of power adjustment but too much adjustment causes its own problems, so if you get a flash with 6 or 7 stops of adjustment, don’t assume that it’s better—it may not be usable at the very lowest power settings because the color temperature of the light may be unacceptable at low settings. If you really need to reduce the power more, just fit a neutral density gel over the light to cut down the power.
Some flash heads have a “click stop” adjustment—the adjustment is something like full power, 1/2, 1/4, etc. Others have a “stepless” adjustment—the power can be set literally anywhere. Stepless control is far better because it allows very precise adjustment.
In the UK, the main fittings are Elinchrom and Bowens, although there are others. There’s nothing to choose between them but there are more manufacturers of accessories available for Bowens (also known as S-fit) than for Elinchrom. Bowens fit accessories that are usually a lot cheaper too.
Some makes have different fittings and some use more than one. At the time of writing this article, Interfit has some lights that use their own fitting, some that use Bowens and some that use Elinchrom. Bear in mind that you’ll be limited to accessories that fit your lights. You can’t for example use Elinchrom fitting accessories on Bowens fitting lights. The same accessory fittings are available in the U.S.A., but the choices also include Balcar, Speedtron and a few others.
There are some lights that don’t have interchangeable accessories at all—the reflectors are fixed.
These lights tend to be at the cheaper end of the range and, although the suppliers can normally supply accessories to fit them, you’ll be pretty limited. You also won’t be able to control the quality of the light as much as if you have lights with Bowens, Elinchrom or another popular fit. Another limitation is that the non-removable reflector stops the light from bouncing around inside a softbox as well as it should. Whether that matters to you or not will depend on the type of photography that you want to do (or that you might want to do in the future). I’m not advising against lights that have fixed reflectors—it might be better for you to spend less and get less, but it’s something that you ought to bear in mind when you make your choice.
The only function of the modeling lamp is to give you an indication of the effect that the flash will have—it doesn’t affect the actual exposure at normal flash shutter speeds. If you’re using softboxes or even umbrellas in a well-lit room, dim modeling lights won’t help you to judge the light. It’s a good idea to get lights with bright modeling lamps (at least 150 watts) but generally bright modeling lamps are only fitted to the better makes, so “you pays your money and you takes your choice.”
Some flash heads have fixed power modeling lamps that are on full power all the time. Others have modeling lamps that can be set to reduced power when required or set to proportional power so that the brightness of the modeling lamp reduces when the power setting is reduced. Proportional modeling lamps can be useful but only if they’re bright enough to see with.
Some flash heads have a built-in cooling fan and some don’t. Again, it depends largely on how much you want to spend. If you get lights without a fan, they’ll work just as well, but the flash heads won’t have such bright modeling lamps and they may overheat if you use them for too long. With a fan fitted, you can expect to be able to use them with accessories like softboxes and umbrellas continuously without risk of overheating. Modeling lamps should never be left switched on if you’re using restrictive light shaping tools like honeycomb grids, spotlights or snoots because they’ll overheat.
The recharging time is the time it takes, after taking a shot, before the flash is ready to be used again. Like most things in life, the more you spend the better the performance, so if you spend a lot you should get a flash that recharges quickly and it you spend a little you may have to wait a long time before the flash is ready to use again. Some of the cheaper flash heads take four seconds to recharge—that’s a very long time if you’re shooting fashion or children but doesn’t matter at all if you’re shooting still life. Recharging time is something to be aware of and may or may not be important to you.
As the name suggests, the indicator tells you when the flash is ready to fire. Again, what you get often depends on what you spend.
There may just be a neon indicator on the back of the flash head. If so that’s fine, but if you’re waiting to shoot you’ll have to watch the control panel on the back of the flash and wait until the light comes on. If the flash head has been positioned behind you, or behind the subject, you won’t be able to see that the indicator has come on.
Most flash heads have an annoying beep that lets you know when the flash is ready and the better ones usually allow you to turn the beep off if you don’t want to hear it. If you’re using more than one light it makes sense to switch the beeper on only on the light that takes longest to recharge (the one set to the highest power) to avoid having to listen to a chorus of annoying beeps!
And some flash heads also have a “modeling lamp off” indicator. What this does is to turn the modeling lamp off as soon as the flash fires, and it stays off until the flash is ready to fire again. Very useful. Again, you can expect to have a choice about whether to use this indicator.
The more expensive flash heads normally have several different ways of letting you know when they’re ready to fire and the cheaper ones don’t. This is a fairly small point, which may or may not be important to you, depending on the type of photography you do and on how you position your lights.
All modern flash heads have a built-in flash sensor. This “sees” the flash from another flash and fires, which means that you only have to trigger one of the flashes (using a radio trigger or infra red trigger) for all of them to fire. The flash that you fire from your radio or infra red trigger should be fitted with a diffused light (softbox or honeycomb) so that the light spreads enough to be picked up by the slave sensor on any other flash heads that you’re using.
Some flash heads have sensors that are sensitive to infra red light as well as to “normal” light. This is important if you want to use an infra red trigger, or if you want to be able to fire the flash with a flash meter fitted with an infra red transmitter.
The best place for the sensor is the top of the flash head, where I can “see” the flash from any direction.
Controls can be on the rear of the flash head or on the side—it doesn’t really matter much although personally I feel that it’s more convenient when they’re on the back. Controls may be simple switches, dials or sliders, and some are illuminated when they’re in use, which is helpful.
Some flash heads have digital displays, which tell you which power you’ve set the light to. Digital displays look pretty but don’t really do anything that a dial or a slider can’t do.
The only thing really worth mentioning about controls is that it helps if they’re big and easy to use.
Flash tubes can fail too, but they very rarely do. They can also break. In case they need to be replaced it’s a good idea to get flash heads that have user-changeable flash tubes (see picture right). It will save you the cost and inconvenience of having to return your flash head to the suppliers.
It seems to make sense to get your lights directly from the manufacturer or importer, rather than from a retailer. Reputable retailers will give good service for as long as the product is under warranty but their obligation to you will end once the warranty has expired. Tempting though it is to save money by buying from Hong Kong or similar suppliers, lights are heavy and expensive to send back if they go wrong, so it’s probably a good idea to buy from a local company that specializes in lighting equipment.
I’ve listed and explained the features that I think are important but what is important to me may not be important to you! Only you can decide whether to buy the cheapest kit on the market, spend your children’s inheritance on the best kit that money can buy or get something in between. Different people have different needs as well as different budgets!
This is a very big question, and impossible to answer in any meaningful terms. All I can usefully do is to give you some pointers so that you can work out the answer for yourself!
There are 3 main factors to take into account when arriving at your decision on power:
At first glance it may look as if you need to get the most powerful flash units you can afford—but doing so might leave you with different problems.
You could have a problem if you want to use a wide aperture to limit depth of field. Will your flash be too powerful? What if you’re using a small digital camera and lens with a minimum aperture of, say, f/5.6? Will you be able to reduce the power enough?
The answer is yes, you can reduce the power. The easiest method is to buy flash units that have a wide range of adjustment. For example, I have Elinchrom flashes that can be adjusted from 75-2400J with 1 head fitted, and I can change the range from 37-1200J simply by fitting a second head and deadheading it (covering it up) so that it doesn’t affect the shot.
If you’re using a digital camera, the ISO settings can be used to “adjust” the level of overall flash power. 100 ISO is pretty much standard for studio work but flash power can be “increased” if necessary by using higher ISO settings, although at the cost of reduced image quality. Professional digital equipment can often be used at much lower settings.
To try and answer this question you first have to decide how large an area you’re likely to have to light. If you’re only going to produce head and shoulder portraits then 100J lights may be adequate, if you want to photograph large family groups you may need about 1000J or more, and if you want to use powerful lighting on small subjects then you need to buy lights that can be adjusted from very low to maximum output.
Quite often, there is simply too much power to allow the use of large apertures. How can you reduce it?
The first thing to do is to turn the power down as far as you can, but sometimes this isn’t enough. If you turn it all the way down on some makes of light, the color temperature will change too much for acceptable results. Below are some other methods. Some can be used with all types of flashhead (including hotshoe flashguns) and some can only be used with generator (pack and head) flashes.
1. Fit a neutral density gel over the light. ND gels are available in a range of strengths. I recommend 0.9, which reduces the power by 3 stops. It’s better to over-reduce and turn the power up than to carry a stock of different gel strengths.
2. Fit a neutral density filter over the camera lens. ND filters are available in a range of strengths. Again, I recommend 0.9, which reduces the power by 3 stops. It’s better to over-reduce and turn the power up than to carry a stock of different filter strengths.
1. As above, plus fit a “deadhead” light. This is simply a second flash head, placed at a distance and facing away from the subject (but not towards the lens). This will divide the power between the flashheads, and with an extra light fitted to a two-head generator will reduce the power by one stop. If available, fit a cap in place of the reflector to ensure that the light cannot affect the lighting.
2. As above, plus: Fit an extension cable. All extension cables cause some loss of power, typically around one stop.
How much power you need depends on:
As I mentioned earlier, power is expressed in Joules or W/s, but this isn’t really power output, just energy stored in the capacitors. The only meaningful expression of power is guide number. The guide number may be artificially inflated by using “favorable” test conditions so if you can’t test the guide number (using an incident light flash meter) for yourself before buying, you need answers to the following questions:
Too much power can be as bad as too little. You can reduce the amount of effective power by:
This article may have helped you to understand the issues—but it hasn’t really helped you to decide how much power is right for your needs
Only you can make that decision. If I was making that decision and was mainly interested in producing creative portraits of single people or couples, I would go for something like 300J of power from a good manufacturer because:
Of course, choosing the right kind of lighting equipment is just an important first step, so this is just the first of a series of articles on light and how to get the best from it. Later articles will focus on the light shaping tools that are used to produce different qualities of light and will include examples of the effects that can be achieved by them as well as guidance on how to achieve those effects.
Garry Edwards is an advertising and commercial photographer who has a special interest in lighting because, as he points out, photography is about light and good lighting can only be obtained in camera, never on the computer. Garry is a published author and has also produced the Photolearn series of videos and written tutorials on lighting. He trains both amateur and professional photographers in studio lighting and is also a technical consultant and product tester for a lighting equipment manufacturer.