HL

ADVANTAGE

• higher light output than bulb - up to 25 lm/W
• longer lifetime (appro. twice as bulbs, depending on bulb type)
• less blackening of glass body - constant light current during the whole lifetime

DISADVANTAGE

• limited lifetime - approx. 1.500 - 3.000 h (depending on bulb type and voltage)
• reduced lifetime with
• blackening of glass body with increasing lifetime
• "yellow" light
• relatively high loss of light energy when penetrating coloured lenses