This is a very good LED light option, at a reasonable price too. Thank you for posting the data, which I incorporated in my lighting forum thread, Lighting an Aquarium with PAR instead of Watts
This can be used for low light tanks up to about 28 inches tall, or medium light tanks up to about 20 inches tall. The 26 watt light should be significantly brighter.
I agree; two thing impressed me most about these LED lamp arrays. The first was the PAR values and the uniformity of the output. The second was the simplicity of the design for installations and retrofits. I agree, it is a quality LED retrofit kit for a very reasonable price....I was amazed when I saw the final production models.
If I have an opportunity I will get you some readings on the 15 watt and 26 watt units as well.