Hi @oreo57Assumption is they are trying to hit the ADA "green look".
It features the same concept as the ADA NAG-150W green metal halide lamp, which is designed to reproduce the "Natural sun light" in order to promote the healthy growth of the aquatic plant. After extensive research, development and strict manufacturing process of the NA-Lamp, the impressive end result shows excellent photosynthesis activity of the aquatic plant. In addition, the high value of true color rendition property brings out the hue of vivid green and red beautifully from the aquatic plant and the fish.
Surely from the image of the lights, the old version is the A401 with the ‘green’ look and the clear diffuser, and the new version in the image is the A301 with the RGB LED’s and the frosted diffuser?
EDIT: Scratch that - the RGB version is the ‘A Plus’ so IDK - their website is confusing as hell 😆
Just wanted to give everyone a heads up. I just receieved a new A series Chihiros light (I have 4 of them on other tanks) and they have done some changes to the LEDs. Made my tank completely green. Looks so bad its like I have green water. Upon contacting Chihiros they said that is the new update and it is similar to the older ones. I can tell you it is not. From the pictures you can see the differemce betweem the previous and new versions. The new light is on the right and older model on the left. It is not a usable light at all unless you like green water. Just dont want anyone to make same mistake.