This is my algae scrubber setup now. I've replaced the light with a 34W energy saving bulb. I believe the colour temp is 2700K range, should be suitable for algae. The chopping board has also been replaced with this vinyl/rubber? kitchen sheet. I'm getting brown algae growth and I have not got time to clean off the algae yet. What you see is since the start of the scrubber.
BTW, I'm also dosing AZNO3 to reduce nitrates. Which may be causing less algae to grow.