Chlorella Variance:Are the Darker or lighter shades better?

I've been taking chlorella for many years now. I've been sticking with the same brand and I noticed that the last few years it has gotten darker. Due to price increase I ordered my chlorella from a different company and this time it's light in color. Without mentioning any brand names can anyone tell me. Which is better the darker or the lighter shades of chlorella?

Is there any difference in benefits at all between them? It seems like maybe the darker might be stronger but then perhaps it's due to chemical fertilizers. Can anybody set me straight on this?

surfsteve
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