light a candle in memory of victims or Ruju' ilal-Allah ?

Re: light a candle in memory of victims or Ruju’ ilal-Allah ?

i was talking about people who do vigil in Pakistan, its exceedingly getting popular.

many people give reference of a hadees for this practice
The Prophet (peace and blessings of Allaah be upon him) passed by two graves and said: “They are being punished, but they are not being punished for something that was difficult to avoid. One of them used not to take precautions to avoid (his body or clothes being soiled by) urine, and the other used to walk around spreading malicious gossip.” Then he took a fresh palm-leaf stalk and split it in two, and placed one piece on each of the two graves. They said: O Messenger of Allaah, why did you do that?” He said: “Perhaps the torment will be reduced for them so long as this does not dry out.” al-Bukhaari (218) and Muslim (292)

but ulema karam saay that it was a one-off occasion, Rasool Allah (S.A.W.) never repeated it after this for anyone else
also some say it was the barakah of Rasool Allah (S.A.W.) hand which placed the leaf on grave, not a property of leaf itself.

but then covering whole grave with flowers and expensive decorated chadars is nothing but israaf. if someone has to follow sunnah, do it the sunnah way.