Light bulb lights up in a fraction of time (blinks) using TRIAC-BT136 and MOC3021 (Solved)
$$R_{in}=\dfrac{V-V_f}{I_f} = \dfrac{5V-1.2V}{15mA} \approx 250 \Omega$$
Definitely your 1k resistor is to be replaced.
You could also have problems with load type switching. The LED bulb isn't just a LED, rather it has an internal power supply circuit. It would be more appropriate to use a circuit for inductive load: