Check the listing for details. Set of 4 Quasar Science Q25 (2') Crossfade Linear Bi-Color LED Tube. Condition: Used. Listed at 189.00 USD. ** This auction is a set of four Q25 Crossfade Linear Bi-Color LED Tubes ***The Q25 Crossfade Linear Bi-Color LED Tube Light from Quasar Science is a 25W linear LED tube light with an expanded bi-color temperature range of 2000 to 6000K. Emitting up to 2250 lumens, this low-profile and versatile tube light is ideal for lighting people or environments. You can hide it unobtrusively in small areas or mount it against a wall or ceiling without compromising your framing. The lamps can be stacked in large, custom-configured arrays, used to create geometric patterns, or be retrofit with existing Kino Flo light units.Self-BallastedNo need for external power supplies or ballastsDimmableCompatible with most dimming systems, flicker-free through entire dimming range