[reefburnaby]

Hi Darren,

If significant amount of actinics is used in a reef, then it can be used more readily than other wavelengths. There is more energy per unit in blue/purple wavelengths than there are in red/yellow wavelengths, so you don't need as much blue to be as effective as a red. On the other hand, it takes more energy to generate at a specific intensity of blue than red...so it all balances out [img]smile.gif[/img]

As for your lumen measurement...it probably isn't accurate since lumen is measurement of instensity centred around one particular wavelength (green). The PAR measurement...have you taken in to account the inaccuracy of the measurement at blue/UV ? Some PAR sensors are off by as much as 50% in the blue spectrum.

- Victor.