So I build a binary clock with led's as outputs. And now it has been suggest to me, that I should make it bigger and use lightbulbs instead of led's. At first I thought I would just use relays, but then I remember they have a limited number of times they can switch. Is there any other element I could use (transistor,...) that would work the same and what would be adjoining circuit.

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    \$\begingroup\$ Triacs or SSRs come to mind, but you can easily find low-ish DC LED assemblies (LED strips and so on, for both constant voltage and constant current driving) that are as powerful as lightbulbs. \$\endgroup\$ – Wesley Lee Feb 26 at 19:19
  • \$\begingroup\$ It's good to use a triac and a zero-cross optoisolator triac driver such as MOC3043, completely replaces the relay. \$\endgroup\$ – Peter MP Feb 26 at 21:40
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    \$\begingroup\$ lightbulbs also won't last long if switched on and off every second. \$\endgroup\$ – Jasen Feb 26 at 23:25
  • \$\begingroup\$ If you just want a bigger/cooler version of your clock, you can beat the efficiency of lightbulbs with the DC high power LED option, and they also don't mind fast switching. \$\endgroup\$ – K H Feb 27 at 3:44

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