Most that I have used fit into the ceramic fixtures. You can get good basking temps with the 45 or 50 watt bulbs(depens on the brand) by either lowering the bulb or raising the basking spot. If you don't have the means to do that, you might have to try diferent watt bulbs until you get a good temp.
good luck
>>I'm going to need to add some heat for summer (AC running). Do these halogen bulbs screw into ceramic lamps? What size/wattage is recommended for a 40 breeder?
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>>1.0 Bearded Dragon - Telamon
>>0.1 House Cat - St. Stephen
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>>1 Saltwater Aquarium
>>1 Freshwater Aquarium
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Bill DiFabio
Garden State Herpetoculture...website to follow...
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"The pendulum of the mind alternates between sense and nonsense,
not between right and wrong." - Carl Jung