How to Determine Polarity on High Wattage LEDs

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After recieving a shipment of 100w & 50w LEDs we realized that without any paperwork or data sheet we needed to identify the polarity of the LED terminals.  There is a plus and minus sign but its not clearly associated with one terminal or another. Although all three are the same brand LED (Lohas-LED) the plus & minus are in different locations on the 50w LED compared to the 100w LEDs.

With a digital multi meter we were able to ID the correct terminals.

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purchased from amazon:

LOHAS® 100W LED Chip Cool White Bulb High Power Energy Saving Lamp Chip

by LOHAS-LED

LOHAS® 50W Red Color LED Chip Bulb High Power Energy Saving Lamp Chip

by LOHAS-LED

Color: Red

LOHAS LED Chips are made of high quality materials, durable for daily use. Very low heat generating, saving energy, environmentally friendly. Long service life. Low consumption, high brightness. Comfortable light source, harmless for skin and eyes. Great for making light sources for fish tank, decoration light, etc. LOHAS LED driver is an electrical device that regulates the power to an LED or string(s) of LEDs. What makes a driver different from conventional power supplies, is that an LED driver responds to the ever-changing needs of the LED, or circuit of LEDs, Supplying a constant amount of power to the LED, as its electrical properties change with temperature.