LED modules in Minor Surgery
and Examination Light applications.

The first thing that creates difficulties when you change from halogen to LED modules is the idea that LED’s don’t create heat. This is totally wrong.

But LED’s create a different kind of heat and heat at much lower temperature, since LED are much more sensitive to heat, it can be drastic. Therefore, please think of using the whole light fitting as a cooling system. A recommendation is to have an outside temperature of max 55°C on your light fitting, (the temperature we can feel as pain is normally between 52-55°C).

If you use aluminum or metal that transfer heat better, the warmer the human skin feel it but if you add a thin layer of plastic or similar, the skin will not feel it as hot even if it has the same temperature. If you do it in this way you will have an easier integration on all new light fittings.

Should you choose integrated driver in each LED module or an external driver? External driver do not have as many features adaptable as with integrated driver including the digital interface for dimmer, fan control, touch less dimmer, CCT control, temp control etc.

The integrated driver can also be an advantage if you want to have just one power supply instead of having one external driver for each LED module. What extra features do you need?

R9 is the most important factor when detecting different kinds of oxygen saturation (different red blood) and similar for muscle fibers etc. There are other factors that are important as well, especially to manage to see and detect differences on different skin colors.

The lux value is often defined as the most important factor, but for the end user/operator there are more important things such as working area, CCT changeable, arm design and dimming features. The dentists are demanding different setup’s than the surgeon.

You can run examination light on max power with good cooling system. Please look at the standard heat sink included in the Svea datasheet DC7LED that can be used.

On Minor Surgery you often have between 50 000 to 120 000 lx and depending on the necessary value (price or high end) you need to use high power on low cost (less modules and more heat) and low power (more modules less heat and better performance but more expensive to produce).

You need to use less power to get a better lux/watt rating due to cooling features. In all applications we need to cool the system.  Less wattage and more LED gives you less heating problematics.