Do you have any info on it? Or a pic?
This is almost the exact same thing I typed, but my dog needed to go outside so I didn't post it.It's 132 watts, so that should be decent for seedlings. I don't know about the distance. Maybe 2-3 feet to start, and if they start stretching you could lower it.
If it's old then there's also a good chance a lot of the bulbs are burnt out.I just found some info on it. Maybe it should be closer than 3 ft. Check this out.
Mars Hydro 300W LED Grow Light Review - Best LED Grow Lights Info
The Mars Hydro 300W is an indoor LED grow light with a full spectrum range suitable for cultivating all types of plants. The light emits an overall voltage ofbestledgrowlightsinfo.com