Staff of light....

[Stephen]

Yano you can use staff of light instead of a slayer staff to cast magic dart?.. Do you still need 55 slayer? Or is that just for the slayer staff?

[Kyle]

Slayer level is a requirement for the spell itself so yes you do need 55.

[Stephen]

oh k cos I didn't know if it was just because you need 55 to wield the slayer staff that it was a requirement

[Kyle]

clarification if it was required:

http://i56.tinypic.com/23ht5yx.jpg

[Jord]

Call me a noob but what does a staff of light do? :P

[Rashelly]

The staff of light is a one-handed staff that requires 75 Magic and 75 Attack to wield. It is obtained as a unique drop from ice strykewyrms, which require 93 Slayer to kill.
The staff of light features a number of properties that are very useful to mages:

It boosts Magic damage by 15%, the second largest boost in the game after the chaotic staff's 20% boost.
When a combat spell is cast with the staff, there is a 1/8 (12.5%) chance that the staff will negate the rune cost for that spell. This chance increases to 20% when wearing combat robes, and 50% when wearing battle robes.
The staff of light can be used instead of a slayer staff to cast Magic Dart.
It has the third highest Magic attack bonus among non-Dungeoneering staves at +17, behind Zuriel's staff (+18) and the master wand (+20).
The staff has a special attack, called Power of Light, that envelopes the user in a shield of light which will reduce all melee damage by 50% for one minute. (Verac the Defiled has a chance to hit full damage through the special.) The special attack uses 100% of the bar, and the effect will run out if the staff of light is unequipped before the minute is up.
The staff of light is also notable for its offensive melee stats, which are unusually high for a Magic weapon. Its stats are comparable to, though superior to, the dragon longsword, and it is the third strongest and second most accurate one-handed non-degrading slash weapon in the game.

taken from http://runescape.wikia.com/wiki/Staff_of_lighthttp://runescape.wikia.com/wiki/Staff_of_light