Different package size depends on power rating of the resistor high wattage resistors must be much larger than low wattage resistors to allow them to dump the heat and not burn out. A 1 watt resistor will be larger than a 14 watt resistor.
Electronics For Absolute Beginners Chapter 2 12 Steps
Resistor Power Rating Chart Wattage Vs Dimension Sizing
Review 22 November 2017 Questions And Answers Ece101
You can determine a resistors wattage with a size chart.
How to size resistor wattage. Find the resistor outline on the chart that most closely matches that of the resistor itself. So having a resistor with at least double the wattage required would be advisable. With carbon composition obsolete and carbon film resistors the physical size of the resistor is proportional to its wattage rating.
I would give the resistor somewhat headroom power wise. So it would be advisable to add a lot of margin. As the dissipated resistor power rating is linked to their physical size a 14 0250w resistor is physically smaller than a 1w resistor and resistors that are of the same ohmic value are also available in different power or wattage ratings.
If the leds voltage is a bit less than 32 v like 31 v the voltage can vary by much more than that the current will rise to 225 ma and the voltage drop across the resistor to 54 v. So in the example of 0603 imperial code this indicates a length of 0060 and a width of 0030. This code contains the width and height of the package.
The size of smd resistors is indicated by a numerical code such as 0603. Your calculations are correct. Place the resistor on the outline to make sure they match.
With wirewound and other power resistors the wattage rating is usually stamped on the resistor body. Then the power will be 120 mw so the 100 mw wont do. Place the size chart see reference on a flat surface.
And also temperature will degrade the capacity of the resistor to handle powerfor example a thin film resistor will handle 80 of power dissipation at 85 degrees celsius and 50 at 100 degrees celsius.
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