I thought I'd share some of my lighting setup and experience. If you want to add your own set-up (inc images of it) and any comments, then please do so. I'm not claiming this is the best way to do things - it's just my way, and it seems to work well for me.
I use flash extensively for macro and close-up work, both indoors and outdoors, and I find it makes an incredible difference to the quality of what I can produce. I know some people are on a tight budget, but you can get some very effective lighting on a reasonable budget, as I hope to show here.
#1 A place to shoot.
This is my home studio. Fancy title - the reality is it's a spare double bedroom in our house. OK, I'm lucky to have that. But it does help to at least have an area of your house where you can keep your gear set up, or mostly set up. Why? because if you can start shooting in a matter of minutes and not have to spend ages setting gear up, you will be more inclined to photograph more often, and will find it less frustrating. The black thing on the wall is one of those Lastolight pop-out portrait blackdrops. I claim I keep it there all the time as it saves time. The truth is I can't fold the damn thing up, and I've yet to meet anyone who can.
2. Lighting units
I have a set of studio lights (see shot below). They are 300WS each, which I think is more than sufficient for table-top work. I could also use them for small portraits, but it wouldn't be enough for a large group shot. I use diffused soft-boxes to give a very soft light as they increase the size of the light source (from the flash bulb to the diffuser panel at the front) The largest softbox is 1 metre across. The larger the light source in relation to the object the softer the light. So for smallish objects including flowers you don't need a large light-source just a relatively large one. Also, the closer the light is the more power it has because of the inverse square law - you remember that from school, don't you?.. With table-top, unlike some other work, you can get up real close, so you may not need as much power as you think.
If buying studio lights it's best to buy a kit - it will be cheaper, and you should get all you need - stands, umbrellas, soft-boxed etc.
These are the studio lights I bought as a kit. Very cheap, but they are very durable and robust. I don't need the highest quality that pros use because they never leave the house. They don't get thrown around. The quality of light from mine costing £350 is the same as a set costing £1,000. There are plenty of kits around from a wide range of suppliers. Check around.
http://www.wexphotographic.com/buy-i...x-kit/p1521669
I also have three flashguns, or 'strobes' as we now call them (if clicking these links to purchase you need to change the product to suit your camera make). A Canon 430EXII http://www.wexphotographic.com/buy-c...shgun/p1027434 A Nissin Di866 Pro http://www.wexphotographic.com/buy-n...n-fit/p1031356 and an old Sigma ring flash http://www.amazon.co.uk/Sigma-EM-140...gma+ring+flash
So which is best? The Canon and the Nissin are both excellent, but the Nissin is more powerful for the same money. Both do High Speed Synch for outdoors. The Nissin does strobe effect photography (multiple exposures in one frame) if you want to do that. But both are quite adequate to shoot on a small scale in a studio. The ring-flash is for more specialized close-up work, and is not suitable as a general flash. Nikon flashes are very good, but like Canon are also top prices. For table-top you don't need anything (I was going to say 'flash' there!) fancy. I always shoot in manual mode which is what you need to do for close-up work. You don't need ETTL unless you are also using the unit for other, more general work.
So... studio flash, or flash gun flash? Both if you can afford it. If you nearly always want to shoot outdoors (flowers say) then it has to be flash-guns. If you mostly want to shoot indoors then a studio flash kit may well be cheaper and will give you more light, plus all the accessories. But if you already have a flash-gun then you can use that in the studio with some light modifiers attached. So the answer is - it depends. Using a flash-gun outdoors for close-up is particularly valuable. You can get some very good creative shots using a flash with a small modifier, so you might want to consider if you need a flashgun for outdoor work as well as table-top.
#3. Doing it at low cost
The cheapest set-up I have is shown below. A Panasonic G6 (£450) a Leica macro lens (£600), The nissin flash (£200) and a Rogue Flashbender (£20) a great little attachment that fits on any flash. You can bend the white panel any way you like and it stays put. It bounces the flash light off the white surface taking away the harsh effect of a naked flash. http://www.amazon.co.uk/Rogue-FlashB...ue+flashbender You don't need fancy wireless triggers, you can use a simple synch cable costing £15 as shown below. The G6 camera doesn't have a synch port so I used a £5 adaptor which fits on any camera. The Nissin is for Canon fit, but with a cable it can be fired by any camera - no ETTL though, but you don't need that for table-top.
If you want a larger light-source then you can now get a large variety of softboxes for flash. I have a Neewer Softbox http://www.amazon.co.uk/Neewer-Porta...neewer+softboxwhich is 60x60cm (but you can get larger ones). It provides a much larger light-source. You need to buy a stand for it, but they can be brought cheaply. As you can see in the shot below, the bracket at the back takes the flashgun (any make) on a special clamp which is adjustable. The head pokes through the opening at the rear of the box. It's just the same as a studio light with softbox attached. So if you already have a flash-gun this could be a cheap option.
#4 Be imaginative
It's all very well having the gear, but it also helps to be imaginative in how you use it. In the shot below I'm using a softbox with a studio flash head (the Interfit) as a white back-drop (on low power). That gives a pure white back ground and also illuminates some of the fine detail in the flower. I'm also using another old studio head overhead to light the front of the flower. That produces images like this one (different flower but same setup.
And just to prove flash works as well as ambient light shooting, if not better, I did a test shot this morning. I shot this orchid using the Panasonic G6 with the Leica lens on f/22 1/125s ISO200. For lighting I used the Nissin Di866 flash gun (£200) in the Neewer softbox (£28) as all shown above. A cheap set-up. I didn't take any real care over the shot. It was hand-held, just to show you can do it even without a tripod. I used a white A4 card to the left of the shot which bounced back some light to the left side of the orchid from the light which was angled from the right side. The black background is the black Lastolight thing - which I still can't fold up.
So... Do you want to go out now and get some lights?