What is the dark resistance?

Under a bright halogen lamp they range between 300-500 Ohms, in a poorly lit room (eg light of my monitor and photoresistor not directly illuminated but enough light to see) they range from 1 to 10 M Ohms then increase to 12-15 M Ohms and higher in darker parts of the room. When completely darkened with my meter on the 20M Ohm scale the resistance increases until my meter no longer can provide a value, so > 20MOhm.

Will this work on a 12v 1.3ah battery

It says in the info about it 150 volts is the maximum. I would say 12v should be fine. If not contact the vendor. I use them for Arduino or ESP32 or ATTINY85/13. I need to do more testing with them. I tried using them a few days ago and it didnt work. I need to play with them more to find out what I was doing wrong. These devices only output 5 volts so that could be the issue i am having.

Will these work in a 28 VAC circuit ?

Maximum wattage is 100 mW so 28 Volts (AC or DC) under a bright light would probably destroy them.

will these detect red laser light?

First off this product says it is manufactured by a company called “eboot”. They not an electronics parts manufacturer of any kind. You may want to contact them for the REAL manufacturer’s name and part number so that you can find the devices response to the laser. Your other option is to build a circuit and experiment with your laser perhaps using a LM339 voltage comparator etc

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💡 Light Up Your Projects with EBOOT's Photoresistors!

DIY DREAM - Unleash your creativity with 30 versatile photoresistors!
ULTIMATE VALUE PACK - 30 pieces ensure you never run out during your innovative endeavors.
HIGH VOLTAGE TOLERANCE - Safely operate up to 150V DC for robust projects.
TEMPERATURE RESILIENCE - Reliable performance in extreme temperatures from -30°C to +70°C.
WIDE LIGHT SENSITIVITY - Perfect for various lighting conditions with 50-100KΩ resistance.

The EBOOT 30 Pieces Photoresistor set includes 5 mm GM5539 resistors, designed for a maximum voltage of 150V DC and a wattage of 100 mW. With a spectral peak of 540 nm and light resistance ranging from 50-100 Kohm, these resistors are perfect for a variety of DIY and hand-working projects, operating efficiently in temperatures from -30°C to +70°C.