tractng

Hello,


Can I use BR40 in a BR30 fixture as long as the wattage is under the manufacturer recommended? It just fits nicer .

tony

Wuzzat?

If the glass bulb size is the same so you get the same amount of free air circulation within the fixture, and the lamp base is in the same base-up or base-down configuration, I can't imagine a reason why you can't.
Of course, UL and the manuf. has the final word on this.

tractng

Thanks. The guy at home depot says I can but what do those guys know

tony

Wuzzat?

And their bias is in the direction of selling you more bulbs.

The 40 is 30% larger in diameter than the 30; how much room is left in the fixture?

olyj52

I have been in the lighting market for 30+ yrs

a BR40 bulb is 40/8ths of an inch wide

a BR30 is 30/8ths of an inch wide

so now you know how bulbs are measured

a F40T12 is 40 watts and 12/8ths of an inch wide

Wuzzat?

Why don't they publish the lux levels for bulbs? It's the reason for buying a bulb.
I had to e-mail the manufacturers to get lux levels for a two-tube troffer and a 75w halogen flood [1800 lux at 5'].

tractng

Good amount of room. They even have a display of the br40 on the same fixture

tony

Wuzzat?

I guess it'll work but if the bulb life is significantly shorter than expected you might try the smaller bulb.