In 2011, Sunshine Kids Juvenile Products changed their name to Diono. Their seats stayed mostly the same, with some changes made to add a booster mode. However, the Radian has changed alot over the years and it can be quite confusing, especially with retroactively increasing their rear facing weight limits in 2008. Here is a break down of the major differences in the seats. Along with the weight limits, I'd like to note there are height limits as well, which I do not have listed here. ***Sunhine Kids/Diono says some of their seats can be used up to the full 65/80 pounds with LATCH if your vehicle was made after Sept 2005. However, I feel it's important to point out that most vehicle manufacturers also have a weight limit for LATCH, and you should abide by that as well.
Diono Radian RXT- Rear facing 5-45 pounds. Forward facing up to 80 pounds. Booster mode up to 120 pounds. ***Diono says LATCH can be used up to 80 pounds in harness mode if your vehicle was made after Sept 2005.
Diono Radian R120- Rear facing 5-45 pounds. Forward facing up to 80 pounds. Booster mode up to 120 pounds. ***Diono says LATCH can be used up to 80 pounds with the harness if your vehicle was made after Sept 2005.
Diono Radian R100- Rear facing 5-40 pounds. Forward facing up to 65 pounds. Booster mode up to 100 pounds. ***Diono says LATCH can be used up to 65 pounds with the harness if your vehicle was made after Sept 2005.
Sunshine Kids Radian XTSL- Rear facing 5-45 pounds. Forward facing up to 80 pounds. Has adjustable headwings. ***Sunshine Kids says LATCH can be used up to 80 pounds if your vehicle was made after Sept 2005.
Sunshine Kids Radian 80SL- Rear facing 5-45 pounds. Forward facing up to 80 pounds. ***Sunshine Kids says LATCH can be used up to 80 pounds if your vehicle was made after Sept 2005.
Sunshine Kids Radian 65SL- Rear facing 5-40 pounds. Forward facing up to 65 pounds. ***Sunshine Kids says LATCH can be used up to 65 pounds
Sunshine Kids Radian XT- Rear facing 5-40 pounds. Forward facing up to 80 pounds. Has adjustable headwings
Sunshine Kids Radian 80- Rear facing 5-35 pounds. Forward facing up to 80 pounds. Seats manufactured after Sept 1, 2008 can be used up to 40 pounds rear facing.
Sunshine Kids Radian 65- Rear facing 5-35 pounds. Forward facing up to 65 pounds. Seats manufactured after Sept ,1 2008 can be used rear facing up to 40 pounds.