How can I measure the amount on algae in water?

I'm doing a science project on how does different color of light effect algae growth I was wondering how to measure the amount of algae in water without haveing to buy a ton of equitment I'm going to be useing 1 gallon container with 30 pond rocks in them they will be place under different color plastic I... show more I'm doing a science project on how does different color of light effect algae growth I was wondering how to measure the amount of algae in water without haveing to buy a ton of equitment I'm going to be useing 1 gallon container with 30 pond rocks in them they will be place under different color plastic I will fetilize them twice a day so the algae will grow after 3 weeks I'll measure the amount of algae in them. (addiontnal information I will keep the water kevel in them equal so evaportion won't be a factor) thank for reading I hope you can tell how to measure the amount of algae!!!!!!!
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