I agree with PokePony ! When it comes to UVB deal with a reputable brand. Some say for turtles but only offer very little UVB rays like 3% or less which is inadequate for a slider. One 5% of higher is best for a slider. Also only a few brands provide both heat and UVB be careful. Like CFL type UVB's do not produce heat so an UVA heat bulb would be needed. Myself I found Mega Rays ( does both , it's a "MV" type) are the best , cost more up front but produce UVB much longer costing less in the long run !