Red light (100W).
Blue light (100W).
Tin foil.
Water.
.
Start off preparing the bicarbonate solution. The bicarbonate is an alternate dissolved source of CO2 for photosynthesis. Take about ⅛ of a teaspoon of baking soda and pour it in a 400 mL beaker. Add 300 mL of water. Stir it up until the sodium bicarbonate is fully mixed with the water. Add one drop of the liquid soap into the bicarbonate mixture. The soap wets the hydrophobic surface of the leaf allowing the solution to be drawn into the leaf. Do this with each beaker. After this, using a straw, cut out 40 uniform leaf disks for spinach leaves. Use more than one spinach leaf for this and try avoiding major veins in the spinach leaf,.
When the cutting out of the disks is done, remove the plunger from the syringe and place 10 of the 40 disks into the syringe barrel. Put the plunger back on and be careful not to crush the spinach disks. Push the plunger until only a small volume of air remains in the syringe barrel. Put some of the bicarbonate solution in the syringe and push out all of the air from the barrel. Holding a finger of the syringe-opening, draw back the plunger to make a vacuum. Hold this for about 8-10 seconds. Let go of the syringe-opening and see if the spinach disks have sunk. If they haven't do this 2-3 more times. Once the spinach disks have sunk, pour the everything from the syringe barrel back into the beaker (including the spinach disks). Right away, fully cover the beaker with tin foil, not allowing any light to get in the beaker. This will slightly prevent the photosynthesis process to occur while preparing the other beakers. Repeat this process for each beaker with another set of 10 spinach disks.
Right away, set up each of the 4 colored lights away from each other. Once the lights are ready, try to decrease as much of the other light as you can (turn off lights, close blind, etc.), the main idea is to have the colored lights focus on the beaker with no other distractions.