The Serfas ESC-350 Combo Light set USL-350/UTL-15 is a great value for a bike light combo set.  For the price, the Serfas ESC-350 Combo light set is one of the best values for a bike light combo set.

• Daytime Flash Mode
• Up To 80 Hrs Runtime
• Extruded Aluminum Body
• Integrated USB Rechargeable Li-Ion Battery
• Backlit Button Indicates Charge Status and Low Battery
• Handlebar Bracket

Specs:

• Solid Mode:
  • Overdrive 605 Lumens - 1.75 hrs
  • High 400 Lumens - 2.75 hrs
  • Medium 200 Lumens - 4 hrs
  • Low 100 Lumens - 8 hrs
• Flash Mode:
  • Daytime 605 Lumens - 80 hrs
  • Low 100 Lumens - 25 hrs

• Size: 103.7mm L x 31mm W x 22.6mm H (4.1" L x 1.22" W x 0.90" H)
• Weight : 162 Grams w/ Bracket
• Battery: 1-Cell Li-Ion
• Charge Time: 4 hrs To Full At 700mA Using USB Wall Charger
• Color: Black

UTL-15 Cosmo 15:

• 3 LED Design
• IPX3 Water Resistance
• Charge To Full In 2 Hrs From Empty
• Last Mode Memory

• Solid Mode:
  • High 15 Lumens - 2 hrs
  • Low 7 Lumens - 4.5 hrs
• Flash Mode:
  • Flash 15 Lumens - 4 hrs
  • KITT 5 Lumens - 14.5 hrs
• Weight: 56 Grams w/ Bracket
• Battery: Lithium Polymer