... , you must pay attention the heat dispersion. The better heat dispersion, the longer lifespan for induction lamp. ... centidegree. The farther between ballast and heat source, the better. 6. Solar system, 12VDC or 24VDC, take care ... in solar system. Together with street fixture, better choice than LED stree tlight.For unit value of induction ... energy induction tunnel lamps best price lamps better than T8