Photoresistors, Phototransistors, Photodiodes which to use?

[supak111]

Can't seem to understand which is best to use here.

I need a super simple light switch for 24v DC. Will be used in a pitch black room, switch should be OFF with no light present, ON when there is light. Which of these can let, say 200 mA through it for 1 second when the light hits it?

Photoresistor, Phototransistor, or Photodiode?

I think i can use second 2 to drive a transistor and then the transistor can conduct enough mA but I'm hoping to keep it simple and not have to add resistors and transistors if possible of course.

Thanks guys

PS I was going to try just using a photoresistor in line with whatever I'm trying to switch ON / OFF?

 

[Harald Kapp]

Neither of these alone will suffice for the job. You will need additional circuitry. Google light sensor circuit and find a bunch of suitable circuits from very simple to rather sophisticated.

 

[supak111]

i was afraid of that but thank you for your answer bud