The fundamental difference between these two fluorescent bulbs is mirrored in their names. The T8 bulbs are eight eighths of an inch in diameter (equivalent to 1 inch thick). The T5 bulbs are thinner at 5/eight of 1 inch thick.
The chart under lists values of total luminous efficacy and efficiency for several varieties of basic service, 120-volt, a thousand-hour lifespan incandescent bulb, and several other idealized gentle sources. The values for the incandescent bulbs are supply efficiencies and efficacies. The values for the ideal sources are radiant efficiencies and efficacies. A similar chart in the article on luminous efficacy compares a broader array of sunshine sources to at least one one other.
These days good judgment would say don’t use mercury and we do not use it where there’s a substitute. For the CFL and for shiny however environment friendly exterior lighting utilizing excessive stress sodium lamps there isn’t a substitute (LEDs are finally becoming a viable substitute). However I stick at being afraid of it and I despair of ever attending to the underside of precisely how harmful it really is. Knowledge is all the time better than fear however all we ever get handed from our specialists” is fear. Yet clearly the example of my grandfather reveals us that mercury ain’t so dangerous as to panic over it.
Firms that sell naked bulbs often present cross references to say which bulb suits each projector. After reviewing several vendor cross reference sheets, it is clear that some companies copy from one another verbatim and a few use different sources. The projector lamp cross references do not need the look and feel of data that’s adapted by many individuals from one source.
The light solid from the dimmable GE Crystal Clear Halogen A19 43W Bulb ($5 for 2) rated highest with our testers, who even preferred it to that of the traditional delicate white incandescent bulb — and we discovered it 43% extra environment friendly. Claimed life span: 1,000 hours (about a 12 months), but the one we’re cycling on and off has lasted 1,500 hours and counting.