Which is better, a 230 volt tanning bed or a 120 volt tanning bed? I get this question a lot, and thought I would answer several emails at once. There are a great number of electricians who give their ‘advice’ on this matter, and unfortunately, they are usually wrong. Because of this, I will try to explain with some detail. And yes, I oversimply a little to keep it readable, so if you are an electrican engineer, don’t scream.
Short answer: It doesn’t matter if the bed is 120V or 230V, and this will not affect the tanning. The tanning lamps don’t about the voltage, only that you supply enough total watts for them to light.
Long answer: While there is basically no difference in powering the SAME bed with 230V or 120V, there is a difference in the electronics that beds use. In general, the 120V electronics tend to be more advanced and of a newer design. There are several different kinds of ballasts that beds use. (Note: the ballast is the part that limits and delivers power to the lamps, thus is a very important and often ignored part of the tanning bed.)
Choke ballast: Oldest type, ballast is basically wire wrapped around an iron core, which produces a magnetic field that limits the current passing through it. Very cheap and reliable but requires the use of lamp starters and runs very hot, meaning it wastes a great deal of electricity. All are 230V, although there is no reason they couldn’t be 120V. No one makes them in 120V for tanning bed use. One ballast per lamp.
Magnetic ballast:Big, heavy bricks, used in many 4 wire 240V beds, although they are usually 120V ballasts. Very reliable, and they can take a great deal of abuse from miswiring, voltage spikes, etc. as they have thermal protection built in. Not the best performers. Two lamps per ballast. Best known are Magnetek and Valmont, although GE also build some of these. Used in many of the older Montego Bay, SonnenBraune, original SCA, Sundash, Tan America and many others. Not as popular now as they once were, party due to their weight and moderate to moderately high cost.
Electronic ballast: This is a general class of ballasts that covers everything from Triad(tm) ballasts to single and double electronic ballasts (look like computer cards) and even Kesio. Some are more efficient than others, they tend to power the lamp nicely but are a bit delicate. Miswiring will almost always fry them, and they are sensitive to voltage spikes. Most are 120V. Most are very light, some are efficient, some are very inefficient (Kesio, for example). Usually powering 2 lamps per ballast. Most are 120V.
High Frequency electronic ballast: Newest generation of ballasts. Super efficient, requiring 30% to 50% less electricity to power a bulb. This means as little as 65 watts to power a 100 watt lamp. They operate at a frequency of over 100,000 hertz, and have almost no thermal loss (3% or less). They can power 2, 3, 4 or more lamps, depending on design. They come in 100V, 120V, 220v, 288v and universal voltages. They work very different than regular ballasts, and the resulting UV output of a tanning bed using them is very different as well. It is difficult to compare to a standard ballast. During the first few minutes of use, the lamps will put out LESS UV than a traditional ballast. After 10-25 minutes, they will put out significantly more UV than a traditional ballast. This means you can just compare the output of systems using the different ballasts with a quick test, and instead must compare entire sessions. These use technology so new it is still under patent, so there are few companies making these ballasts, and few companies selling beds that use them. They are also somewhat expensive.
I have actually done a great deal of lab work comparing the new high frequency ballasts to more traditional ballasts, and in the interest of full disclosure, the company I work for switched to using only high frequency ballasts due to those tests. SunMaster started testing new generation ballasts back in the mid 1990s, with the goal of making a 24 lamp tanning bed that could plug in the wall. We tested many different ballasts for output, durability, cycle testing and the like. We also conducted tests in a couple of different labs for comparison. So yes, I have a bias when it comes to ballasts, but it is based on years of testing.
So, in the end there is a difference in 120V and 230V beds, but generally you will get the same tan with either. The main difference is how much electricity they soak up to get the job done. Me, of course I’m partial to the HF ballasts that SunMaster uses, which are mainly 120V for home tanning beds. The tan is the same, but you end up spending up to half the money to actually power the bed, which saves you money in the long run.
As for other 120V brands and ballasts, they still should do the same job as the 230V systems. Many electrians will mistakenly tell people that “230V is more efficient” but that simply isn’t true for tanning beds. Yes, for your air conditioner or other devices that have heavy, moving motors, then 230V is more efficient only because of the armature design (I won’t elaborate, trust me on this) but a tanning bed is primarily a ‘light fixture that you lay on’, and has almost no moving parts.
So buy based on your needs and if you can get a 24 lamp bed that runs on 120V, that is a good thing. You will pay a little more for the bed, but you will save money on the install since you don’t need an electrician to install it. In the long run, you will save some money on electricity, and yes, the bed will have a lower carbon footprint.
Dennis