LPL 7452 Power Supply

[Luis-F-S]

I just received an LPL 7452 Power Supply and Lamp Housing. Both use the round 4 pin plug and the lamp works with the power supply. Both are 120 V. One thing has me puzzled, the lamp housing says 200 W 82 V. I thought the 7452 used a 250 W 82 V lamp as shown on the power supply. Does anyone know if "early" 7452 were perhaps 200 W? Anyone else have one like this? For what I paid for it, I'm keeping it as it was purchased as a back up. Thanks, Luis

135094

[Luis-F-S]

Since no one has ever encountered this before, I asked Kevin at KHB. His reply was that early in production the LPL 7451 and the 7452 (USA models 4500-II and 4550XL) used different fan/lamp housings with different cooling configurations. The 7451 used a lamp housing that simply blew cooling air around the outside of the lamp chamber. The lamp chamber was light tight and had no ventilation holes etc. They limited this to a 200W lamp. With the introduction of the XL version (either 7452 or 4550XL) they increased the lamp specification to 250w by actually ventilating the lamp chamber. Cooling air was forced by the fan through the lamp housing and not just around it. This required a light tight baffle over the fan, ventilation holes in the lamp chamber and exhaust venting through the lamp chamber cover assembly. For a good number of years they continued to produce 2 different lamphouse assemblies. As production quantities declined they rationalized production and both the 7451 (4500-II) and the 7452 (4550XL) were supplied with the fully ventilated lamphouse assembly. Both could use the 250w lamp but they continued to supply the 200w lamp in the 7451 (4500-II) version and put a 200W sticker on it!

Now aren't you glad I brought this up.........L

[Mick Fagan]

Now aren't you glad I brought this up.........L

As a matter of fact, yes.

Always interesting to understand why some things are done, or seem to be done differently than what would be logical.

Mick.

[Armin Seeholzer]

Interesting I use a 7451 since 8 years only with 250W lamps it give me shorter times and in my opinion the lamps last longer then the 200 Watt lamps!
I do not see any bad effects at all, but I'm not a daily user!

Cheers Armin

[Luis-F-S]

Interesting I use a 7451 since 8 years only with 250W lamps it give me shorter times and in my opinion the lamps last longer then the 200 Watt lamps.

Cheers Armin

Check the fan housing. If there is an opening at the top of the lamp house assembly, then there is exhaust venting through the lamp chamber cover assembly. The fan should also protrude as shown on the left side of my photo above. If so, then you have the 250W lamp housing. If there is no opening at the top, and the fan is flat with the side of the housing, then you have a 200W lamphouse and you're on your own with using the larger wattage lamp. L