I have had a 98 LED Mag light style for a year now, and it runs forever on the D cells I put in over three months ago.
Never a problem.Use it all inspections
Very bright , but not good for across a attic.
Got it at Murrys auto parts for 19.99
Sears sells a Terminator 6 watt that is a very good lite. Single led runs on 6 AA batteries, strong bright white beam, last 30 hours on rechargables. $50.00