Bob, Almost all types of modern lighting can produce VHF interference, an unfortunate consequence of 'green' legislation in many countries. My method is to go and test an example with a FT817 and short antenna and check for noise. CFL bulbs, I have seen low frequency HF noise but nothing at VHF. Most of the lighting at my EME station is 230V CFL bulbs. LED lighting - most have some form of SMPS and the majority, even with an EMC marking, do produce some VHF noise. Some examples were detectable at 12ft with a 'rubber duck' antenna on 144MHz. The LED 'halogen replacement bulbs' sold in the local DIY stores are a complete nightmare. The SMPS is in the bulb holder with almost no room for EMC filtering! Conventional fluorescent tubes themselves are fine at VHF (not so hot on 1.8MHz) but I have detected VHF noise from newer 'electronic ballast' systems. Conventional ballasts I have not seen any VHF issues. Halogen bulbs are fine, the ones I have in the kitchen are 230V ones. BUT; the low voltage ones tend to have a SMPS or 'electronic transformer' which can be as bad as LED systems. One problem in Europe is that even the ones with a CE certification, which should include EMC testing, does not address the issue of radiated emissions from the supply cables above 30MHz. If I had a choice I would stick to filament bulbs or tube fluorescents and not worry about the cost. 73 John G4SWX