Hello,

I recently bought an L21B from convoy, which appears to be a fantastic thrower from my 4 camping trips of use. I was hoping someone could explain the differences between the 3x21 series. They come in A, B, C, D, and E versions. Or if there is a resource that explain the difference that I’m missing please let me know. Sorry to waste your time if there’s an explanation page I’m missing I swear I tried to find the difference for a half hour today. https://convoylight.com/collections/3x21

Convoy 3x21D from 5 ft away with a temp gun from harbor freight. I decided to try this out because my wife was about 10 ft from me facing away and I told her not to turn around and close her eyes because I was about to turbo her. She said to stop because it was getting hot. I didn't believe her until she did it to me 😂. I indeed felt the heat from ten feet away. So I needed some scientific numbers to confirm. Don't get me wrong, I know they put off heat, I'm just impressed at how much and at the distance . These are the results. I stopped at 90 degrees fahrenheit not sure how much hotter it will get.

Based on personal experiences, which one fared better? What did you like about your light?

I'm debating between sft40/sbt90.2 on either of these lights. I'm just not sure about runtime/efficiency on either of these LEDs for these units and how well the beam would work at say 600 meters for either. Real world use it'd be used to scan for animals afar, specifically night predators.