From the pictures, 3.2 circuit, we use the photo transistor is supposed at first light sensor, photo transistor has not been light internal resistance of phototransistor have much value. The flowing stream, less now that the positive terminal of the C2 will fire about 0.2-0.3 volts. But when phototransistor are light resistance is decreased, the anode of C2 มีไฟ higher strength, this fire will be coupling through. C2 go into B of TR1 makes TR1 work at the legs C of TR1 will fire down momentarily makes flip of act stealthily.TR2 TR3 and hypothetical first TR2 work LED1 will stick TR3 will not work shall not touch relay page LED2 won't stick, but when. Photo transistor exposure will make TR1 work while TR2 will stop working LED1 will be extinguished TR3.LED2 will stick to alternate work. Based on the light impact photo transistor.
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