Light the Lights

Thomas of QEGS Wakefield identified the rules:

To light the YELLOW light the rule is: < $30$

To light the RED light the rule is: Have an odd tens digit

To light the BLUE light the rule is: Multiple of $5$

To light the GREEN light the rule is: Is odd

Ahmad reasoned well to explain the minimum number which lit up all the lights:

The answer is $15$.

Its tens digit is the smallest, from the allowed, which is $10$. Its unit digit is $5$ ; it is not zero because then it would be even and wouldn't light the green. It is also less than $30$.

Are you both sure that the yellow light only lights up for numbers under $30$?