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Rating: 
Summary: Better deal and reliability with different voltage
Review: 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).
Rating: 
Summary: Lighten Up!
Review: The Zelco Booklight Replacement Bulbs are by far the best replacement bulbs that I have encountered and you can bet your sweet bippy that I have seen my share of replacement bulbs. These are great bulbs for the "Kremloc illuminated hat". The only problem I've encountered is if you have 4 or more bulbs hanging off the front visor you might get a bit "snowblind". This happened to me while I was driving my cab unfortunately for a family of geese that were crossing the road. Ah well, say la vee. Anyhoo aside from that fowl incident (yuk yuk) I can't say enough about these light bulbs except this: They work best at night or in areas of minimal lighting.
Rating: 
Summary: Short Life
Review: These bulbs are very expensive and very short lived. Unfortunately it is almost impossible to find a cheaper replacement with the same amp and watt rating. You are hooked into buying these bulbs for your itty bitty if you want the same brightness. These bulbs progressively darken as the tungsten is burned off the filament and deposited on the bulb surface, so the light begins a dimming process almost immediately. This whole system from Zelco needs reengineering. Beware!
Rating:
Summary: Replacement Bulbs are Essential for many reasons...
Review: You might still be able to read with the bulb in your "Itty Bitty Book Light" but the truth is, if you notice the light
dimming, it is because the bulb is darkening from the inside. I found that my bulb had turned a nice mercury color and that explained why I was having trouble reading in the dark. So, it might be essential to change the bulb even before
it stops working.
Rating:
Summary: itty bitty replacements
Review: You need replacements, well, as far as the lamp that goes with these, well, my kids have had them for some time and use them all the time so the quality of the lightbulbs is great- I was sent a couple replacements with the light when they got them for gifts but to this day have not had to replace them.
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