Better deal and reliability with different voltage
I've used Zelco's booklights for years and discovered early on that their bulbs burn out quickly - no doubt a nice profit center for the company since replacement bulbs cost about a dime each when bought in bulk. The problem is that four 1.5 volt batteries (or the AC adapter) produce 6 volts and while called 6 volt bulbs these things actually work optimally at 5 volts (which 4 rechargable NiCad batteries would produce but that's another discussion). The solution is to hit Radio Shack or a similar vendor (maybe amazon has them?) and buy 7.5 volt replacement bulbs (they're about a buck each at full retail). You get very slightly less light but a single bulb has now lasted me almost 3 years of nightly use because the filament in the bulb is burning at a lower temperature. So only buy these 6 volt bulbs if you like replacing bulbs frequently and/or need the extra 7% of light they squeeze out of their overworked overheated filaments or are using NiCad rechargable batteries (which although they're called 1.5 volt batteries only produce 1.3 volts).More detail ...
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