4. (5 points) A construction team installed 1200 streetlights in the first month, 1300 streetlights in the second month. At this point, there are still 500 streetlights left to be installed. The total number of installed streetlights is $\qquad$ times the number of uninstalled streetlights.
【Analysis】First, calculate the total number of streetlights that have been installed, which is $1200+1300=2500$. Then, according to the meaning of division, the solution can be obtained.

【Solution】Solution: $(1200+1300) \div 500$
$$
\begin{array}{l}
=2500 \div 500 \\
=5 \text { (times); }
\end{array}
$$

Answer: The total number of installed streetlights is 5 times the number of uninstalled streetlights.
Therefore, the answer is: 5.
【Comment】First, calculating the total number of installed streetlights is the key to solving this problem.