Day/night switch for 12V LED light with minimal power consumption

TECHNICAL SUPPORT Sensors & Modules
1

Customer:

Looking for an electronic switch to turn on an LED light at night and turn it off during the day. The light replaces a 12V/10W automotive bulb. Everything is powered by a 12V battery, and minimal power consumption is essential since the switch needs to operate daily and ideally the battery should last at least 14 days. Alternatively, a lower-power LED could be used instead.

Original message (Croatian)

Traži se sklopka /prekidač (elektronički) za uključenje LED žarulje

(zamjena za 12V/10W auto žarulju !) po noći , tj.

isključenje KLED svjetla danju. Sve se napaja iz Akku 12V

i potrebna je minimalna potrošnja jer je uključenje predviđeno svakodnevno, minimalno

bi moralo trajati 14 dana uz raspoloživ Akku 12C7 25 Ah.

Moguće je i zamjeniti LED sa nekim koji manje troši.

Originally submitted via email support on 3 September 2016. Migrated to the forum for community visibility.

2

Soldered Support:

Just to clarify: you’re looking for an automated day/night switch that turns on at night and deactivates during the day for a load of around 1-2W (an LED replacement)?

3

Customer:

Correct, a day/night switch. The 10W bulb has been replaced with an appropriate LED (LED with the same socket for 12V) so we’re talking about approximately 1-2W power consumption. Unfortunately I don’t know the exact specification—I would need to check the LED in use.

Original message (Croatian)

Točno, prekidač dan/noć, no ne 10W snage žarulje, već

Je takva žarulja zamjenjena adekvatnom LED žaruljom (LED diodama sa istim grlom za 12V)

pa se dakle radi o cca 1-2 W snage LED-a. Nažalost ne znam točno, morao bih pogledati LED koji korstim.

Lp [name removed]

Attachment omitted in migration: image001.jpg

4

Soldered Support:

We don’t have a ready-made solution, but we have a very simple circuit that will do what you need: Dark/Light sensor using transistor – BuildCircuit.COM

Instead of BC547 you can use 2N2222 (which we stock) and the power supply can be 12V. You will need a light-dependent resistor (LDR) and several resistors.

Original message (Croatian)

nažalost nemamo nekakvo gotovo rješenje, ali imamo super-jednostavan strujni krug koji će odraditi ono što trebate: Dark/Light sensor using transistor – BuildCircuit.COM
Umjesto BC547 možete koristiti 2N2222 (kojega imamo na webshopu) i izvor napajanja može biti 12V. Trebat ćete fotootpornik i nekoliko otpornika.