Easily identifiable if you have good eyes, mine unfortunately let me down, comes to many with age

Thanks for that it will help a lot, I think...

I also need to source proper photographic filters, the sunglass lenses are a more likely source of the difference.

Again thanks.
Hugo

I have been running a few simple tests after reading an article about lighting, which basically said that Metal Haliide bulbs give off more plant usable light than High Pressure Sodiums, and that horticulturalists are wasting money and power using hps in the flowering/fruiting stage of growth. I dec...